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Finding the Fourth Proportional to 259,724.40, 389,601.36 and 72,750.48

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Solution

The fourth proportional to 259,724.40, 389,601.36 and 72,750.48 is: 109,129.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,724.40 : 389,601.36 = 72,750.48 : x
  2. Step 2: Convert to fraction form
    259,724.40/389,601.36 = 72,750.48/x
  3. Step 3: Cross multiply
    259,724.40x = 389,601.36 × 72,750.48
  4. Step 4: Simplify right side
    259,724.40x = 28,343,685,948.65
  5. Step 5: Solve for x
    x = 28,343,685,948.65/259,724.40
  6. Step 6: Final answer
    x = 109,129.85

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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.