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Finding the Fourth Proportional to 65.32, 90.15 and 36.21

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Solution

The fourth proportional to 65.32, 90.15 and 36.21 is: 49.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.32 : 90.15 = 36.21 : x
  2. Step 2: Convert to fraction form
    65.32/90.15 = 36.21/x
  3. Step 3: Cross multiply
    65.32x = 90.15 × 36.21
  4. Step 4: Simplify right side
    65.32x = 3,264.53
  5. Step 5: Solve for x
    x = 3,264.53/65.32
  6. Step 6: Final answer
    x = 49.98

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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.