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Finding the Fourth Proportional to 831.21, 1,147.08 and 477.15

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Solution

The fourth proportional to 831.21, 1,147.08 and 477.15 is: 658.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.21 : 1,147.08 = 477.15 : x
  2. Step 2: Convert to fraction form
    831.21/1,147.08 = 477.15/x
  3. Step 3: Cross multiply
    831.21x = 1,147.08 × 477.15
  4. Step 4: Simplify right side
    831.21x = 547,329.22
  5. Step 5: Solve for x
    x = 547,329.22/831.21
  6. Step 6: Final answer
    x = 658.47

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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.