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Finding the Fourth Proportional to 86,381.66, 129,279.90 and 53,122.82

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Solution

The fourth proportional to 86,381.66, 129,279.90 and 53,122.82 is: 79,504.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,381.66 : 129,279.90 = 53,122.82 : x
  2. Step 2: Convert to fraction form
    86,381.66/129,279.90 = 53,122.82/x
  3. Step 3: Cross multiply
    86,381.66x = 129,279.90 × 53,122.82
  4. Step 4: Simplify right side
    86,381.66x = 6,867,712,857.32
  5. Step 5: Solve for x
    x = 6,867,712,857.32/86,381.66
  6. Step 6: Final answer
    x = 79,504.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.