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Finding the Fourth Proportional to 65.72, 90.68 and 36.61

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Solution

The fourth proportional to 65.72, 90.68 and 36.61 is: 50.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.72 : 90.68 = 36.61 : x
  2. Step 2: Convert to fraction form
    65.72/90.68 = 36.61/x
  3. Step 3: Cross multiply
    65.72x = 90.68 × 36.61
  4. Step 4: Simplify right side
    65.72x = 3,319.79
  5. Step 5: Solve for x
    x = 3,319.79/65.72
  6. Step 6: Final answer
    x = 50.51

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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.