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Finding the Fourth Proportional to 89.74, 123.89 and 56.55

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Solution

The fourth proportional to 89.74, 123.89 and 56.55 is: 78.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.74 : 123.89 = 56.55 : x
  2. Step 2: Convert to fraction form
    89.74/123.89 = 56.55/x
  3. Step 3: Cross multiply
    89.74x = 123.89 × 56.55
  4. Step 4: Simplify right side
    89.74x = 7,005.98
  5. Step 5: Solve for x
    x = 7,005.98/89.74
  6. Step 6: Final answer
    x = 78.07

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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.