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Finding the Fourth Proportional to 831.47, 1,147.49 and 499.91

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Solution

The fourth proportional to 831.47, 1,147.49 and 499.91 is: 689.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.47 : 1,147.49 = 499.91 : x
  2. Step 2: Convert to fraction form
    831.47/1,147.49 = 499.91/x
  3. Step 3: Cross multiply
    831.47x = 1,147.49 × 499.91
  4. Step 4: Simplify right side
    831.47x = 573,633.49
  5. Step 5: Solve for x
    x = 573,633.49/831.47
  6. Step 6: Final answer
    x = 689.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.