Home / 28,638.24-42,781.32-20,672.70

Finding the Fourth Proportional to 28,638.24, 42,781.32 and 20,672.70

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Solution

The fourth proportional to 28,638.24, 42,781.32 and 20,672.70 is: 30,881.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638.24 : 42,781.32 = 20,672.70 : x
  2. Step 2: Convert to fraction form
    28,638.24/42,781.32 = 20,672.70/x
  3. Step 3: Cross multiply
    28,638.24x = 42,781.32 × 20,672.70
  4. Step 4: Simplify right side
    28,638.24x = 884,405,393.96
  5. Step 5: Solve for x
    x = 884,405,393.96/28,638.24
  6. Step 6: Final answer
    x = 30,881.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.