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Finding the Fourth Proportional to 65.35, 90.17 and 39.13

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Solution

The fourth proportional to 65.35, 90.17 and 39.13 is: 53.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.35 : 90.17 = 39.13 : x
  2. Step 2: Convert to fraction form
    65.35/90.17 = 39.13/x
  3. Step 3: Cross multiply
    65.35x = 90.17 × 39.13
  4. Step 4: Simplify right side
    65.35x = 3,528.42
  5. Step 5: Solve for x
    x = 3,528.42/65.35
  6. Step 6: Final answer
    x = 53.99

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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.