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Finding the Fourth Proportional to 89.57, 123.56 and 56.85

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Solution

The fourth proportional to 89.57, 123.56 and 56.85 is: 78.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.57 : 123.56 = 56.85 : x
  2. Step 2: Convert to fraction form
    89.57/123.56 = 56.85/x
  3. Step 3: Cross multiply
    89.57x = 123.56 × 56.85
  4. Step 4: Simplify right side
    89.57x = 7,023.85
  5. Step 5: Solve for x
    x = 7,023.85/89.57
  6. Step 6: Final answer
    x = 78.42

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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.