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Finding the Fourth Proportional to 831.49, 1,147.47 and 477.47

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Solution

The fourth proportional to 831.49, 1,147.47 and 477.47 is: 658.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.49 : 1,147.47 = 477.47 : x
  2. Step 2: Convert to fraction form
    831.49/1,147.47 = 477.47/x
  3. Step 3: Cross multiply
    831.49x = 1,147.47 × 477.47
  4. Step 4: Simplify right side
    831.49x = 547,874.38
  5. Step 5: Solve for x
    x = 547,874.38/831.49
  6. Step 6: Final answer
    x = 658.91

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Half scale
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Double scale
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1.5x scale

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.