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Finding the Fourth Proportional to 87.15, 130.74 and 26.30

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Solution

The fourth proportional to 87.15, 130.74 and 26.30 is: 39.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.15 : 130.74 = 26.30 : x
  2. Step 2: Convert to fraction form
    87.15/130.74 = 26.30/x
  3. Step 3: Cross multiply
    87.15x = 130.74 × 26.30
  4. Step 4: Simplify right side
    87.15x = 3,438.40
  5. Step 5: Solve for x
    x = 3,438.40/87.15
  6. Step 6: Final answer
    x = 39.45

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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.