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Finding the Fourth Proportional to 360.71, 540.86 and 129.55

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Solution

The fourth proportional to 360.71, 540.86 and 129.55 is: 194.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.71 : 540.86 = 129.55 : x
  2. Step 2: Convert to fraction form
    360.71/540.86 = 129.55/x
  3. Step 3: Cross multiply
    360.71x = 540.86 × 129.55
  4. Step 4: Simplify right side
    360.71x = 70,068.41
  5. Step 5: Solve for x
    x = 70,068.41/360.71
  6. Step 6: Final answer
    x = 194.25

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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.