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Finding the Fourth Proportional to 914.90, 1,261.85 and 619.65

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Solution

The fourth proportional to 914.90, 1,261.85 and 619.65 is: 854.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.90 : 1,261.85 = 619.65 : x
  2. Step 2: Convert to fraction form
    914.90/1,261.85 = 619.65/x
  3. Step 3: Cross multiply
    914.90x = 1,261.85 × 619.65
  4. Step 4: Simplify right side
    914.90x = 781,902.25
  5. Step 5: Solve for x
    x = 781,902.25/914.90
  6. Step 6: Final answer
    x = 854.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.