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Finding the Fourth Proportional to 831.29, 1,246.66 and 420.16

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Solution

The fourth proportional to 831.29, 1,246.66 and 420.16 is: 630.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.29 : 1,246.66 = 420.16 : x
  2. Step 2: Convert to fraction form
    831.29/1,246.66 = 420.16/x
  3. Step 3: Cross multiply
    831.29x = 1,246.66 × 420.16
  4. Step 4: Simplify right side
    831.29x = 523,796.67
  5. Step 5: Solve for x
    x = 523,796.67/831.29
  6. Step 6: Final answer
    x = 630.10

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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.