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Finding the Fourth Proportional to 688.27, 1,031.40 and 395.17

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Solution

The fourth proportional to 688.27, 1,031.40 and 395.17 is: 592.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.27 : 1,031.40 = 395.17 : x
  2. Step 2: Convert to fraction form
    688.27/1,031.40 = 395.17/x
  3. Step 3: Cross multiply
    688.27x = 1,031.40 × 395.17
  4. Step 4: Simplify right side
    688.27x = 407,578.34
  5. Step 5: Solve for x
    x = 407,578.34/688.27
  6. Step 6: Final answer
    x = 592.18

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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.