Home / 20,489.12-28,283.70-13,778.62

Finding the Fourth Proportional to 20,489.12, 28,283.70 and 13,778.62

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Solution

The fourth proportional to 20,489.12, 28,283.70 and 13,778.62 is: 19,020.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.12 : 28,283.70 = 13,778.62 : x
  2. Step 2: Convert to fraction form
    20,489.12/28,283.70 = 13,778.62/x
  3. Step 3: Cross multiply
    20,489.12x = 28,283.70 × 13,778.62
  4. Step 4: Simplify right side
    20,489.12x = 389,710,354.49
  5. Step 5: Solve for x
    x = 389,710,354.49/20,489.12
  6. Step 6: Final answer
    x = 19,020.36

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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.