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Finding the Fourth Proportional to 59.74, 89.78 and 55.20

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Solution

The fourth proportional to 59.74, 89.78 and 55.20 is: 82.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.74 : 89.78 = 55.20 : x
  2. Step 2: Convert to fraction form
    59.74/89.78 = 55.20/x
  3. Step 3: Cross multiply
    59.74x = 89.78 × 55.20
  4. Step 4: Simplify right side
    59.74x = 4,955.86
  5. Step 5: Solve for x
    x = 4,955.86/59.74
  6. Step 6: Final answer
    x = 82.96

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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.