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Finding the Fourth Proportional to 65.57, 90.37 and 55.18

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Solution

The fourth proportional to 65.57, 90.37 and 55.18 is: 76.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.57 : 90.37 = 55.18 : x
  2. Step 2: Convert to fraction form
    65.57/90.37 = 55.18/x
  3. Step 3: Cross multiply
    65.57x = 90.37 × 55.18
  4. Step 4: Simplify right side
    65.57x = 4,985.89
  5. Step 5: Solve for x
    x = 4,985.89/65.57
  6. Step 6: Final answer
    x = 76.04

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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.