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Finding the Fourth Proportional to 520,056.10, 780,084.15 and 253,987.30

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Solution

The fourth proportional to 520,056.10, 780,084.15 and 253,987.30 is: 380,980.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,056.10 : 780,084.15 = 253,987.30 : x
  2. Step 2: Convert to fraction form
    520,056.10/780,084.15 = 253,987.30/x
  3. Step 3: Cross multiply
    520,056.10x = 780,084.15 × 253,987.30
  4. Step 4: Simplify right side
    520,056.10x = 198,131,467,031.30
  5. Step 5: Solve for x
    x = 198,131,467,031.30/520,056.10
  6. Step 6: Final answer
    x = 380,980.95

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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.