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Finding the Fourth Proportional to 130.15, 179.64 and 74.91

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Solution

The fourth proportional to 130.15, 179.64 and 74.91 is: 103.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.15 : 179.64 = 74.91 : x
  2. Step 2: Convert to fraction form
    130.15/179.64 = 74.91/x
  3. Step 3: Cross multiply
    130.15x = 179.64 × 74.91
  4. Step 4: Simplify right side
    130.15x = 13,456.50
  5. Step 5: Solve for x
    x = 13,456.50/130.15
  6. Step 6: Final answer
    x = 103.39

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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.