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Finding the Fourth Proportional to 99.53, 137.33 and 64.57

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Solution

The fourth proportional to 99.53, 137.33 and 64.57 is: 89.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.53 : 137.33 = 64.57 : x
  2. Step 2: Convert to fraction form
    99.53/137.33 = 64.57/x
  3. Step 3: Cross multiply
    99.53x = 137.33 × 64.57
  4. Step 4: Simplify right side
    99.53x = 8,867.40
  5. Step 5: Solve for x
    x = 8,867.40/99.53
  6. Step 6: Final answer
    x = 89.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.