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Finding the Fourth Proportional to 91.68, 127.30 and 89.48

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Solution

The fourth proportional to 91.68, 127.30 and 89.48 is: 124.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.68 : 127.30 = 89.48 : x
  2. Step 2: Convert to fraction form
    91.68/127.30 = 89.48/x
  3. Step 3: Cross multiply
    91.68x = 127.30 × 89.48
  4. Step 4: Simplify right side
    91.68x = 11,389.72
  5. Step 5: Solve for x
    x = 11,389.72/91.68
  6. Step 6: Final answer
    x = 124.23

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.