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Finding the Fourth Proportional to 831.74, 1,242.43 and 615.74

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Solution

The fourth proportional to 831.74, 1,242.43 and 615.74 is: 919.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.74 : 1,242.43 = 615.74 : x
  2. Step 2: Convert to fraction form
    831.74/1,242.43 = 615.74/x
  3. Step 3: Cross multiply
    831.74x = 1,242.43 × 615.74
  4. Step 4: Simplify right side
    831.74x = 765,013.85
  5. Step 5: Solve for x
    x = 765,013.85/831.74
  6. Step 6: Final answer
    x = 919.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.