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Finding the Fourth Proportional to 28,321.92, 39,081.96 and 15,746.40

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Solution

The fourth proportional to 28,321.92, 39,081.96 and 15,746.40 is: 21,728.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,321.92 : 39,081.96 = 15,746.40 : x
  2. Step 2: Convert to fraction form
    28,321.92/39,081.96 = 15,746.40/x
  3. Step 3: Cross multiply
    28,321.92x = 39,081.96 × 15,746.40
  4. Step 4: Simplify right side
    28,321.92x = 615,400,174.94
  5. Step 5: Solve for x
    x = 615,400,174.94/28,321.92
  6. Step 6: Final answer
    x = 21,728.76

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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.