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Finding the Fourth Proportional to 919,863, 1,379,794.50 and 255,015

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Solution

The fourth proportional to 919,863, 1,379,794.50 and 255,015 is: 382,522.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    919,863 : 1,379,794.50 = 255,015 : x
  2. Step 2: Convert to fraction form
    919,863/1,379,794.50 = 255,015/x
  3. Step 3: Cross multiply
    919,863x = 1,379,794.50 × 255,015
  4. Step 4: Simplify right side
    919,863x = 351,868,294,417.50
  5. Step 5: Solve for x
    x = 351,868,294,417.50/919,863
  6. Step 6: Final answer
    x = 382,522.50

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.