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Finding the Fourth Proportional to 91.02, 135.56 and 85.38

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Solution

The fourth proportional to 91.02, 135.56 and 85.38 is: 127.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.02 : 135.56 = 85.38 : x
  2. Step 2: Convert to fraction form
    91.02/135.56 = 85.38/x
  3. Step 3: Cross multiply
    91.02x = 135.56 × 85.38
  4. Step 4: Simplify right side
    91.02x = 11,574.11
  5. Step 5: Solve for x
    x = 11,574.11/91.02
  6. Step 6: Final answer
    x = 127.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.