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Finding the Fourth Proportional to 89.39, 123.39 and 56.59

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Solution

The fourth proportional to 89.39, 123.39 and 56.59 is: 78.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.39 : 123.39 = 56.59 : x
  2. Step 2: Convert to fraction form
    89.39/123.39 = 56.59/x
  3. Step 3: Cross multiply
    89.39x = 123.39 × 56.59
  4. Step 4: Simplify right side
    89.39x = 6,982.64
  5. Step 5: Solve for x
    x = 6,982.64/89.39
  6. Step 6: Final answer
    x = 78.11

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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.