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Finding the Fourth Proportional to 478.59, 717.89 and 131.91

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Solution

The fourth proportional to 478.59, 717.89 and 131.91 is: 197.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.59 : 717.89 = 131.91 : x
  2. Step 2: Convert to fraction form
    478.59/717.89 = 131.91/x
  3. Step 3: Cross multiply
    478.59x = 717.89 × 131.91
  4. Step 4: Simplify right side
    478.59x = 94,696.21
  5. Step 5: Solve for x
    x = 94,696.21/478.59
  6. Step 6: Final answer
    x = 197.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.