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Finding the Fourth Proportional to 65.46, 90.18 and 57.26

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Solution

The fourth proportional to 65.46, 90.18 and 57.26 is: 78.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.46 : 90.18 = 57.26 : x
  2. Step 2: Convert to fraction form
    65.46/90.18 = 57.26/x
  3. Step 3: Cross multiply
    65.46x = 90.18 × 57.26
  4. Step 4: Simplify right side
    65.46x = 5,163.71
  5. Step 5: Solve for x
    x = 5,163.71/65.46
  6. Step 6: Final answer
    x = 78.88

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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.