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Finding the Fourth Proportional to 130.39, 179.92 and 72.18

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Solution

The fourth proportional to 130.39, 179.92 and 72.18 is: 99.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.39 : 179.92 = 72.18 : x
  2. Step 2: Convert to fraction form
    130.39/179.92 = 72.18/x
  3. Step 3: Cross multiply
    130.39x = 179.92 × 72.18
  4. Step 4: Simplify right side
    130.39x = 12,986.63
  5. Step 5: Solve for x
    x = 12,986.63/130.39
  6. Step 6: Final answer
    x = 99.60

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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.