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Finding the Fourth Proportional to 60.21, 89.91 and 57.11

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Solution

The fourth proportional to 60.21, 89.91 and 57.11 is: 85.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.21 : 89.91 = 57.11 : x
  2. Step 2: Convert to fraction form
    60.21/89.91 = 57.11/x
  3. Step 3: Cross multiply
    60.21x = 89.91 × 57.11
  4. Step 4: Simplify right side
    60.21x = 5,134.76
  5. Step 5: Solve for x
    x = 5,134.76/60.21
  6. Step 6: Final answer
    x = 85.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.