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Finding the Fourth Proportional to 127.42, 191.10 and 87.07

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Solution

The fourth proportional to 127.42, 191.10 and 87.07 is: 130.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.42 : 191.10 = 87.07 : x
  2. Step 2: Convert to fraction form
    127.42/191.10 = 87.07/x
  3. Step 3: Cross multiply
    127.42x = 191.10 × 87.07
  4. Step 4: Simplify right side
    127.42x = 16,639.08
  5. Step 5: Solve for x
    x = 16,639.08/127.42
  6. Step 6: Final answer
    x = 130.58

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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.