Home / 28,320.52-39,083.70-15,745

Finding the Fourth Proportional to 28,320.52, 39,083.70 and 15,745

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Solution

The fourth proportional to 28,320.52, 39,083.70 and 15,745 is: 21,728.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,320.52 : 39,083.70 = 15,745 : x
  2. Step 2: Convert to fraction form
    28,320.52/39,083.70 = 15,745/x
  3. Step 3: Cross multiply
    28,320.52x = 39,083.70 × 15,745
  4. Step 4: Simplify right side
    28,320.52x = 615,372,856.50
  5. Step 5: Solve for x
    x = 615,372,856.50/28,320.52
  6. Step 6: Final answer
    x = 21,728.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.