Home / 20,849.50-28,772.40-13,397.50

Finding the Fourth Proportional to 20,849.50, 28,772.40 and 13,397.50

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Solution

The fourth proportional to 20,849.50, 28,772.40 and 13,397.50 is: 18,488.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,849.50 : 28,772.40 = 13,397.50 : x
  2. Step 2: Convert to fraction form
    20,849.50/28,772.40 = 13,397.50/x
  3. Step 3: Cross multiply
    20,849.50x = 28,772.40 × 13,397.50
  4. Step 4: Simplify right side
    20,849.50x = 385,478,229
  5. Step 5: Solve for x
    x = 385,478,229/20,849.50
  6. Step 6: Final answer
    x = 18,488.61

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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.