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Finding the Fourth Proportional to 87.07, 130.67 and 79.51

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Solution

The fourth proportional to 87.07, 130.67 and 79.51 is: 119.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.07 : 130.67 = 79.51 : x
  2. Step 2: Convert to fraction form
    87.07/130.67 = 79.51/x
  3. Step 3: Cross multiply
    87.07x = 130.67 × 79.51
  4. Step 4: Simplify right side
    87.07x = 10,389.57
  5. Step 5: Solve for x
    x = 10,389.57/87.07
  6. Step 6: Final answer
    x = 119.32

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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.