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Finding the Fourth Proportional to 84.35, 125.78 and 79.00

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Solution

The fourth proportional to 84.35, 125.78 and 79.00 is: 117.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.35 : 125.78 = 79.00 : x
  2. Step 2: Convert to fraction form
    84.35/125.78 = 79.00/x
  3. Step 3: Cross multiply
    84.35x = 125.78 × 79.00
  4. Step 4: Simplify right side
    84.35x = 9,935.99
  5. Step 5: Solve for x
    x = 9,935.99/84.35
  6. Step 6: Final answer
    x = 117.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.