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Finding the Fourth Proportional to 831.47, 1,147.38 and 477.31

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Solution

The fourth proportional to 831.47, 1,147.38 and 477.31 is: 658.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.47 : 1,147.38 = 477.31 : x
  2. Step 2: Convert to fraction form
    831.47/1,147.38 = 477.31/x
  3. Step 3: Cross multiply
    831.47x = 1,147.38 × 477.31
  4. Step 4: Simplify right side
    831.47x = 547,655.95
  5. Step 5: Solve for x
    x = 547,655.95/831.47
  6. Step 6: Final answer
    x = 658.66

Related Problems

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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.