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Finding the Fourth Proportional to 898.50, 1,349.25 and 831.15

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Solution

The fourth proportional to 898.50, 1,349.25 and 831.15 is: 1,248.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.50 : 1,349.25 = 831.15 : x
  2. Step 2: Convert to fraction form
    898.50/1,349.25 = 831.15/x
  3. Step 3: Cross multiply
    898.50x = 1,349.25 × 831.15
  4. Step 4: Simplify right side
    898.50x = 1,121,429.14
  5. Step 5: Solve for x
    x = 1,121,429.14/898.50
  6. Step 6: Final answer
    x = 1,248.11

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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.