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Finding the Fourth Proportional to 1,332.47, 1,998.03 and 407.81

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Solution

The fourth proportional to 1,332.47, 1,998.03 and 407.81 is: 611.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.47 : 1,998.03 = 407.81 : x
  2. Step 2: Convert to fraction form
    1,332.47/1,998.03 = 407.81/x
  3. Step 3: Cross multiply
    1,332.47x = 1,998.03 × 407.81
  4. Step 4: Simplify right side
    1,332.47x = 814,816.61
  5. Step 5: Solve for x
    x = 814,816.61/1,332.47
  6. Step 6: Final answer
    x = 611.51

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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.