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Finding the Fourth Proportional to 130.82, 180.54 and 72.61

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Solution

The fourth proportional to 130.82, 180.54 and 72.61 is: 100.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.82 : 180.54 = 72.61 : x
  2. Step 2: Convert to fraction form
    130.82/180.54 = 72.61/x
  3. Step 3: Cross multiply
    130.82x = 180.54 × 72.61
  4. Step 4: Simplify right side
    130.82x = 13,108.11
  5. Step 5: Solve for x
    x = 13,108.11/130.82
  6. Step 6: Final answer
    x = 100.20

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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.