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Finding the Fourth Proportional to 866.16, 1,300.68 and 831.24

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Solution

The fourth proportional to 866.16, 1,300.68 and 831.24 is: 1,248.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.16 : 1,300.68 = 831.24 : x
  2. Step 2: Convert to fraction form
    866.16/1,300.68 = 831.24/x
  3. Step 3: Cross multiply
    866.16x = 1,300.68 × 831.24
  4. Step 4: Simplify right side
    866.16x = 1,081,177.24
  5. Step 5: Solve for x
    x = 1,081,177.24/866.16
  6. Step 6: Final answer
    x = 1,248.24

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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.