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Finding the Fourth Proportional to 86,388.66, 129,290.40 and 53,129.82

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Solution

The fourth proportional to 86,388.66, 129,290.40 and 53,129.82 is: 79,514.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,388.66 : 129,290.40 = 53,129.82 : x
  2. Step 2: Convert to fraction form
    86,388.66/129,290.40 = 53,129.82/x
  3. Step 3: Cross multiply
    86,388.66x = 129,290.40 × 53,129.82
  4. Step 4: Simplify right side
    86,388.66x = 6,869,175,679.73
  5. Step 5: Solve for x
    x = 6,869,175,679.73/86,388.66
  6. Step 6: Final answer
    x = 79,514.78

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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.