Home / 20,817.77-28,693.52-15,780.38

Finding the Fourth Proportional to 20,817.77, 28,693.52 and 15,780.38

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Solution

The fourth proportional to 20,817.77, 28,693.52 and 15,780.38 is: 21,750.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.77 : 28,693.52 = 15,780.38 : x
  2. Step 2: Convert to fraction form
    20,817.77/28,693.52 = 15,780.38/x
  3. Step 3: Cross multiply
    20,817.77x = 28,693.52 × 15,780.38
  4. Step 4: Simplify right side
    20,817.77x = 452,794,426.77
  5. Step 5: Solve for x
    x = 452,794,426.77/20,817.77
  6. Step 6: Final answer
    x = 21,750.39

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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.