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Finding the Fourth Proportional to 59.78, 82.68 and 56.74

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Solution

The fourth proportional to 59.78, 82.68 and 56.74 is: 78.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.78 : 82.68 = 56.74 : x
  2. Step 2: Convert to fraction form
    59.78/82.68 = 56.74/x
  3. Step 3: Cross multiply
    59.78x = 82.68 × 56.74
  4. Step 4: Simplify right side
    59.78x = 4,691.26
  5. Step 5: Solve for x
    x = 4,691.26/59.78
  6. Step 6: Final answer
    x = 78.48

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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.