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Finding the Fourth Proportional to 478.68, 717.94 and 131.93

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Solution

The fourth proportional to 478.68, 717.94 and 131.93 is: 197.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.68 : 717.94 = 131.93 : x
  2. Step 2: Convert to fraction form
    478.68/717.94 = 131.93/x
  3. Step 3: Cross multiply
    478.68x = 717.94 × 131.93
  4. Step 4: Simplify right side
    478.68x = 94,718.74
  5. Step 5: Solve for x
    x = 94,718.74/478.68
  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.