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Finding the Fourth Proportional to 831.41, 1,146.66 and 499.61

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Solution

The fourth proportional to 831.41, 1,146.66 and 499.61 is: 689.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.41 : 1,146.66 = 499.61 : x
  2. Step 2: Convert to fraction form
    831.41/1,146.66 = 499.61/x
  3. Step 3: Cross multiply
    831.41x = 1,146.66 × 499.61
  4. Step 4: Simplify right side
    831.41x = 572,877.07
  5. Step 5: Solve for x
    x = 572,877.07/831.41
  6. Step 6: Final answer
    x = 689.04

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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.