Home / 20,855.30-28,780.38-11,424.06

Finding the Fourth Proportional to 20,855.30, 28,780.38 and 11,424.06

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Solution

The fourth proportional to 20,855.30, 28,780.38 and 11,424.06 is: 15,765.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.30 : 28,780.38 = 11,424.06 : x
  2. Step 2: Convert to fraction form
    20,855.30/28,780.38 = 11,424.06/x
  3. Step 3: Cross multiply
    20,855.30x = 28,780.38 × 11,424.06
  4. Step 4: Simplify right side
    20,855.30x = 328,788,787.94
  5. Step 5: Solve for x
    x = 328,788,787.94/20,855.30
  6. Step 6: Final answer
    x = 15,765.24

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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.