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Finding the Fourth Proportional to 769.16, 1,154.61 and 457.49

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Solution

The fourth proportional to 769.16, 1,154.61 and 457.49 is: 686.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.16 : 1,154.61 = 457.49 : x
  2. Step 2: Convert to fraction form
    769.16/1,154.61 = 457.49/x
  3. Step 3: Cross multiply
    769.16x = 1,154.61 × 457.49
  4. Step 4: Simplify right side
    769.16x = 528,217.62
  5. Step 5: Solve for x
    x = 528,217.62/769.16
  6. Step 6: Final answer
    x = 686.74

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Double scale
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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.