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Finding the Fourth Proportional to 470.76, 649.78 and 330.91

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Solution

The fourth proportional to 470.76, 649.78 and 330.91 is: 456.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.76 : 649.78 = 330.91 : x
  2. Step 2: Convert to fraction form
    470.76/649.78 = 330.91/x
  3. Step 3: Cross multiply
    470.76x = 649.78 × 330.91
  4. Step 4: Simplify right side
    470.76x = 215,013.80
  5. Step 5: Solve for x
    x = 215,013.80/470.76
  6. Step 6: Final answer
    x = 456.74

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Double scale
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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.