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Finding the Fourth Proportional to 478.19, 717.20 and 131.55

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Solution

The fourth proportional to 478.19, 717.20 and 131.55 is: 197.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.19 : 717.20 = 131.55 : x
  2. Step 2: Convert to fraction form
    478.19/717.20 = 131.55/x
  3. Step 3: Cross multiply
    478.19x = 717.20 × 131.55
  4. Step 4: Simplify right side
    478.19x = 94,347.66
  5. Step 5: Solve for x
    x = 94,347.66/478.19
  6. Step 6: Final answer
    x = 197.30

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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.