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Finding the Fourth Proportional to 87.21, 130.61 and 48.60

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Solution

The fourth proportional to 87.21, 130.61 and 48.60 is: 72.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.21 : 130.61 = 48.60 : x
  2. Step 2: Convert to fraction form
    87.21/130.61 = 48.60/x
  3. Step 3: Cross multiply
    87.21x = 130.61 × 48.60
  4. Step 4: Simplify right side
    87.21x = 6,347.77
  5. Step 5: Solve for x
    x = 6,347.77/87.21
  6. Step 6: Final answer
    x = 72.79

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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.