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Finding the Fourth Proportional to 688.18, 1,031.73 and 358.97

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Solution

The fourth proportional to 688.18, 1,031.73 and 358.97 is: 538.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.18 : 1,031.73 = 358.97 : x
  2. Step 2: Convert to fraction form
    688.18/1,031.73 = 358.97/x
  3. Step 3: Cross multiply
    688.18x = 1,031.73 × 358.97
  4. Step 4: Simplify right side
    688.18x = 370,360.12
  5. Step 5: Solve for x
    x = 370,360.12/688.18
  6. Step 6: Final answer
    x = 538.17

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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.