Home / 28,436.57-39,242.21-15,689.87

Finding the Fourth Proportional to 28,436.57, 39,242.21 and 15,689.87

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Solution

The fourth proportional to 28,436.57, 39,242.21 and 15,689.87 is: 21,651.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,436.57 : 39,242.21 = 15,689.87 : x
  2. Step 2: Convert to fraction form
    28,436.57/39,242.21 = 15,689.87/x
  3. Step 3: Cross multiply
    28,436.57x = 39,242.21 × 15,689.87
  4. Step 4: Simplify right side
    28,436.57x = 615,705,045.91
  5. Step 5: Solve for x
    x = 615,705,045.91/28,436.57
  6. Step 6: Final answer
    x = 21,651.88

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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.