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Finding the Fourth Proportional to 86,139.37, 129,185.70 and 54,501.91

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Solution

The fourth proportional to 86,139.37, 129,185.70 and 54,501.91 is: 81,738.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,139.37 : 129,185.70 = 54,501.91 : x
  2. Step 2: Convert to fraction form
    86,139.37/129,185.70 = 54,501.91/x
  3. Step 3: Cross multiply
    86,139.37x = 129,185.70 × 54,501.91
  4. Step 4: Simplify right side
    86,139.37x = 7,040,866,748.76
  5. Step 5: Solve for x
    x = 7,040,866,748.76/86,139.37
  6. Step 6: Final answer
    x = 81,738.08

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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.