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Finding the Fourth Proportional to 91.28, 135.75 and 90.37

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Solution

The fourth proportional to 91.28, 135.75 and 90.37 is: 134.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.28 : 135.75 = 90.37 : x
  2. Step 2: Convert to fraction form
    91.28/135.75 = 90.37/x
  3. Step 3: Cross multiply
    91.28x = 135.75 × 90.37
  4. Step 4: Simplify right side
    91.28x = 12,267.22
  5. Step 5: Solve for x
    x = 12,267.22/91.28
  6. Step 6: Final answer
    x = 134.40

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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.