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Finding the Fourth Proportional to 478.19, 660.02 and 291.61

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Solution

The fourth proportional to 478.19, 660.02 and 291.61 is: 402.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.19 : 660.02 = 291.61 : x
  2. Step 2: Convert to fraction form
    478.19/660.02 = 291.61/x
  3. Step 3: Cross multiply
    478.19x = 660.02 × 291.61
  4. Step 4: Simplify right side
    478.19x = 192,468.43
  5. Step 5: Solve for x
    x = 192,468.43/478.19
  6. Step 6: Final answer
    x = 402.49

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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.