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Finding the Fourth Proportional to 89.70, 123.62 and 83.58

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Solution

The fourth proportional to 89.70, 123.62 and 83.58 is: 115.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.70 : 123.62 = 83.58 : x
  2. Step 2: Convert to fraction form
    89.70/123.62 = 83.58/x
  3. Step 3: Cross multiply
    89.70x = 123.62 × 83.58
  4. Step 4: Simplify right side
    89.70x = 10,332.16
  5. Step 5: Solve for x
    x = 10,332.16/89.70
  6. Step 6: Final answer
    x = 115.19

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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.