Home / 20,836.98-31,379.40-18,781.20

Finding the Fourth Proportional to 20,836.98, 31,379.40 and 18,781.20

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Solution

The fourth proportional to 20,836.98, 31,379.40 and 18,781.20 is: 28,283.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,836.98 : 31,379.40 = 18,781.20 : x
  2. Step 2: Convert to fraction form
    20,836.98/31,379.40 = 18,781.20/x
  3. Step 3: Cross multiply
    20,836.98x = 31,379.40 × 18,781.20
  4. Step 4: Simplify right side
    20,836.98x = 589,342,787.28
  5. Step 5: Solve for x
    x = 589,342,787.28/20,836.98
  6. Step 6: Final answer
    x = 28,283.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.