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Finding the Fourth Proportional to 65.71, 90.67 and 36.20

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Solution

The fourth proportional to 65.71, 90.67 and 36.20 is: 49.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.71 : 90.67 = 36.20 : x
  2. Step 2: Convert to fraction form
    65.71/90.67 = 36.20/x
  3. Step 3: Cross multiply
    65.71x = 90.67 × 36.20
  4. Step 4: Simplify right side
    65.71x = 3,282.25
  5. Step 5: Solve for x
    x = 3,282.25/65.71
  6. Step 6: Final answer
    x = 49.95

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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.