Home / 28,426.56-39,228.86-15,680.20

Finding the Fourth Proportional to 28,426.56, 39,228.86 and 15,680.20

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Solution

The fourth proportional to 28,426.56, 39,228.86 and 15,680.20 is: 21,638.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,426.56 : 39,228.86 = 15,680.20 : x
  2. Step 2: Convert to fraction form
    28,426.56/39,228.86 = 15,680.20/x
  3. Step 3: Cross multiply
    28,426.56x = 39,228.86 × 15,680.20
  4. Step 4: Simplify right side
    28,426.56x = 615,116,370.57
  5. Step 5: Solve for x
    x = 615,116,370.57/28,426.56
  6. Step 6: Final answer
    x = 21,638.79

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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.