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Finding the Fourth Proportional to 691.71, 1,035.28 and 418.33

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Solution

The fourth proportional to 691.71, 1,035.28 and 418.33 is: 626.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.71 : 1,035.28 = 418.33 : x
  2. Step 2: Convert to fraction form
    691.71/1,035.28 = 418.33/x
  3. Step 3: Cross multiply
    691.71x = 1,035.28 × 418.33
  4. Step 4: Simplify right side
    691.71x = 433,088.68
  5. Step 5: Solve for x
    x = 433,088.68/691.71
  6. Step 6: Final answer
    x = 626.11

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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.