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Finding the Fourth Proportional to 89.57, 123.49 and 56.77

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Solution

The fourth proportional to 89.57, 123.49 and 56.77 is: 78.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.57 : 123.49 = 56.77 : x
  2. Step 2: Convert to fraction form
    89.57/123.49 = 56.77/x
  3. Step 3: Cross multiply
    89.57x = 123.49 × 56.77
  4. Step 4: Simplify right side
    89.57x = 7,010.53
  5. Step 5: Solve for x
    x = 7,010.53/89.57
  6. Step 6: Final answer
    x = 78.27

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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.