Home / 28,002.60-38,680.40-20,916.72

Finding the Fourth Proportional to 28,002.60, 38,680.40 and 20,916.72

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Solution

The fourth proportional to 28,002.60, 38,680.40 and 20,916.72 is: 28,892.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,002.60 : 38,680.40 = 20,916.72 : x
  2. Step 2: Convert to fraction form
    28,002.60/38,680.40 = 20,916.72/x
  3. Step 3: Cross multiply
    28,002.60x = 38,680.40 × 20,916.72
  4. Step 4: Simplify right side
    28,002.60x = 809,067,096.29
  5. Step 5: Solve for x
    x = 809,067,096.29/28,002.60
  6. Step 6: Final answer
    x = 28,892.57

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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.