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Finding the Fourth Proportional to 89.56, 123.46 and 72.05

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Solution

The fourth proportional to 89.56, 123.46 and 72.05 is: 99.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.56 : 123.46 = 72.05 : x
  2. Step 2: Convert to fraction form
    89.56/123.46 = 72.05/x
  3. Step 3: Cross multiply
    89.56x = 123.46 × 72.05
  4. Step 4: Simplify right side
    89.56x = 8,895.29
  5. Step 5: Solve for x
    x = 8,895.29/89.56
  6. Step 6: Final answer
    x = 99.32

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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.