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Finding the Fourth Proportional to 65.34, 90.16 and 39.11

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Solution

The fourth proportional to 65.34, 90.16 and 39.11 is: 53.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.34 : 90.16 = 39.11 : x
  2. Step 2: Convert to fraction form
    65.34/90.16 = 39.11/x
  3. Step 3: Cross multiply
    65.34x = 90.16 × 39.11
  4. Step 4: Simplify right side
    65.34x = 3,526.16
  5. Step 5: Solve for x
    x = 3,526.16/65.34
  6. Step 6: Final answer
    x = 53.97

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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.