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Finding the Fourth Proportional to 259,320, 389,045.72 and 72,331.52

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Solution

The fourth proportional to 259,320, 389,045.72 and 72,331.52 is: 108,515.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,320 : 389,045.72 = 72,331.52 : x
  2. Step 2: Convert to fraction form
    259,320/389,045.72 = 72,331.52/x
  3. Step 3: Cross multiply
    259,320x = 389,045.72 × 72,331.52
  4. Step 4: Simplify right side
    259,320x = 28,140,268,277.09
  5. Step 5: Solve for x
    x = 28,140,268,277.09/259,320
  6. Step 6: Final answer
    x = 108,515.61

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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.