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Finding the Fourth Proportional to 1,332.72, 1,998.94 and 358.90

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Solution

The fourth proportional to 1,332.72, 1,998.94 and 358.90 is: 538.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.72 : 1,998.94 = 358.90 : x
  2. Step 2: Convert to fraction form
    1,332.72/1,998.94 = 358.90/x
  3. Step 3: Cross multiply
    1,332.72x = 1,998.94 × 358.90
  4. Step 4: Simplify right side
    1,332.72x = 717,419.57
  5. Step 5: Solve for x
    x = 717,419.57/1,332.72
  6. Step 6: Final answer
    x = 538.31

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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.