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Finding the Fourth Proportional to 91.35, 137.03 and 90.72

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Solution

The fourth proportional to 91.35, 137.03 and 90.72 is: 136.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.35 : 137.03 = 90.72 : x
  2. Step 2: Convert to fraction form
    91.35/137.03 = 90.72/x
  3. Step 3: Cross multiply
    91.35x = 137.03 × 90.72
  4. Step 4: Simplify right side
    91.35x = 12,430.91
  5. Step 5: Solve for x
    x = 12,430.91/91.35
  6. Step 6: Final answer
    x = 136.08

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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.