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Finding the Fourth Proportional to 87.05, 130.64 and 35.72

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Solution

The fourth proportional to 87.05, 130.64 and 35.72 is: 53.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.05 : 130.64 = 35.72 : x
  2. Step 2: Convert to fraction form
    87.05/130.64 = 35.72/x
  3. Step 3: Cross multiply
    87.05x = 130.64 × 35.72
  4. Step 4: Simplify right side
    87.05x = 4,665.63
  5. Step 5: Solve for x
    x = 4,665.63/87.05
  6. Step 6: Final answer
    x = 53.60

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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.