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Finding the Fourth Proportional to 59.91, 89.76 and 57.18

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Solution

The fourth proportional to 59.91, 89.76 and 57.18 is: 85.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.91 : 89.76 = 57.18 : x
  2. Step 2: Convert to fraction form
    59.91/89.76 = 57.18/x
  3. Step 3: Cross multiply
    59.91x = 89.76 × 57.18
  4. Step 4: Simplify right side
    59.91x = 5,132.45
  5. Step 5: Solve for x
    x = 5,132.45/59.91
  6. Step 6: Final answer
    x = 85.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.