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Finding the Fourth Proportional to 83.99, 115.91 and 51.23

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Solution

The fourth proportional to 83.99, 115.91 and 51.23 is: 70.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.99 : 115.91 = 51.23 : x
  2. Step 2: Convert to fraction form
    83.99/115.91 = 51.23/x
  3. Step 3: Cross multiply
    83.99x = 115.91 × 51.23
  4. Step 4: Simplify right side
    83.99x = 5,937.81
  5. Step 5: Solve for x
    x = 5,937.81/83.99
  6. Step 6: Final answer
    x = 70.70

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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.