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Finding the Fourth Proportional to 688.59, 1,032.93 and 318.24

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Solution

The fourth proportional to 688.59, 1,032.93 and 318.24 is: 477.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.59 : 1,032.93 = 318.24 : x
  2. Step 2: Convert to fraction form
    688.59/1,032.93 = 318.24/x
  3. Step 3: Cross multiply
    688.59x = 1,032.93 × 318.24
  4. Step 4: Simplify right side
    688.59x = 328,719.64
  5. Step 5: Solve for x
    x = 328,719.64/688.59
  6. Step 6: Final answer
    x = 477.38

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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.