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Finding the Fourth Proportional to 65.16, 89.91 and 39.29

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Solution

The fourth proportional to 65.16, 89.91 and 39.29 is: 54.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.16 : 89.91 = 39.29 : x
  2. Step 2: Convert to fraction form
    65.16/89.91 = 39.29/x
  3. Step 3: Cross multiply
    65.16x = 89.91 × 39.29
  4. Step 4: Simplify right side
    65.16x = 3,532.11
  5. Step 5: Solve for x
    x = 3,532.11/65.16
  6. Step 6: Final answer
    x = 54.21

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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.