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Finding the Fourth Proportional to 91.35, 137.05 and 64.35

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Solution

The fourth proportional to 91.35, 137.05 and 64.35 is: 96.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.35 : 137.05 = 64.35 : x
  2. Step 2: Convert to fraction form
    91.35/137.05 = 64.35/x
  3. Step 3: Cross multiply
    91.35x = 137.05 × 64.35
  4. Step 4: Simplify right side
    91.35x = 8,819.01
  5. Step 5: Solve for x
    x = 8,819.01/91.35
  6. Step 6: Final answer
    x = 96.54

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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.