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Finding the Fourth Proportional to 89.40, 123.38 and 52.56

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Solution

The fourth proportional to 89.40, 123.38 and 52.56 is: 72.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.40 : 123.38 = 52.56 : x
  2. Step 2: Convert to fraction form
    89.40/123.38 = 52.56/x
  3. Step 3: Cross multiply
    89.40x = 123.38 × 52.56
  4. Step 4: Simplify right side
    89.40x = 6,484.59
  5. Step 5: Solve for x
    x = 6,484.59/89.40
  6. Step 6: Final answer
    x = 72.54

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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.