Home / 28,431.91-39,236.33-15,685.54

Finding the Fourth Proportional to 28,431.91, 39,236.33 and 15,685.54

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Solution

The fourth proportional to 28,431.91, 39,236.33 and 15,685.54 is: 21,646.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,431.91 : 39,236.33 = 15,685.54 : x
  2. Step 2: Convert to fraction form
    28,431.91/39,236.33 = 15,685.54/x
  3. Step 3: Cross multiply
    28,431.91x = 39,236.33 × 15,685.54
  4. Step 4: Simplify right side
    28,431.91x = 615,443,023.67
  5. Step 5: Solve for x
    x = 615,443,023.67/28,431.91
  6. Step 6: Final answer
    x = 21,646.21

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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.