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Finding the Fourth Proportional to 127.48, 191.01 and 90.74

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Solution

The fourth proportional to 127.48, 191.01 and 90.74 is: 135.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.48 : 191.01 = 90.74 : x
  2. Step 2: Convert to fraction form
    127.48/191.01 = 90.74/x
  3. Step 3: Cross multiply
    127.48x = 191.01 × 90.74
  4. Step 4: Simplify right side
    127.48x = 17,332.25
  5. Step 5: Solve for x
    x = 17,332.25/127.48
  6. Step 6: Final answer
    x = 135.96

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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.