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Finding the Fourth Proportional to 89.70, 123.75 and 54.69

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Solution

The fourth proportional to 89.70, 123.75 and 54.69 is: 75.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.70 : 123.75 = 54.69 : x
  2. Step 2: Convert to fraction form
    89.70/123.75 = 54.69/x
  3. Step 3: Cross multiply
    89.70x = 123.75 × 54.69
  4. Step 4: Simplify right side
    89.70x = 6,767.89
  5. Step 5: Solve for x
    x = 6,767.89/89.70
  6. Step 6: Final answer
    x = 75.45

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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.