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Finding the Fourth Proportional to 1,079.46, 1,490.27 and 831.47

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Solution

The fourth proportional to 1,079.46, 1,490.27 and 831.47 is: 1,147.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.46 : 1,490.27 = 831.47 : x
  2. Step 2: Convert to fraction form
    1,079.46/1,490.27 = 831.47/x
  3. Step 3: Cross multiply
    1,079.46x = 1,490.27 × 831.47
  4. Step 4: Simplify right side
    1,079.46x = 1,239,103.19
  5. Step 5: Solve for x
    x = 1,239,103.19/1,079.46
  6. Step 6: Final answer
    x = 1,147.89

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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.