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Finding the Fourth Proportional to 84.03, 125.29 and 78.87

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Solution

The fourth proportional to 84.03, 125.29 and 78.87 is: 117.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.03 : 125.29 = 78.87 : x
  2. Step 2: Convert to fraction form
    84.03/125.29 = 78.87/x
  3. Step 3: Cross multiply
    84.03x = 125.29 × 78.87
  4. Step 4: Simplify right side
    84.03x = 9,881.23
  5. Step 5: Solve for x
    x = 9,881.23/84.03
  6. Step 6: Final answer
    x = 117.59

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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.