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Finding the Fourth Proportional to 130.15, 179.61 and 71.94

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Solution

The fourth proportional to 130.15, 179.61 and 71.94 is: 99.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.15 : 179.61 = 71.94 : x
  2. Step 2: Convert to fraction form
    130.15/179.61 = 71.94/x
  3. Step 3: Cross multiply
    130.15x = 179.61 × 71.94
  4. Step 4: Simplify right side
    130.15x = 12,921.14
  5. Step 5: Solve for x
    x = 12,921.14/130.15
  6. Step 6: Final answer
    x = 99.28

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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.