Home / 20,689.22-28,551.08-11,257.79

Finding the Fourth Proportional to 20,689.22, 28,551.08 and 11,257.79

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Solution

The fourth proportional to 20,689.22, 28,551.08 and 11,257.79 is: 15,535.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.22 : 28,551.08 = 11,257.79 : x
  2. Step 2: Convert to fraction form
    20,689.22/28,551.08 = 11,257.79/x
  3. Step 3: Cross multiply
    20,689.22x = 28,551.08 × 11,257.79
  4. Step 4: Simplify right side
    20,689.22x = 321,421,948.30
  5. Step 5: Solve for x
    x = 321,421,948.30/20,689.22
  6. Step 6: Final answer
    x = 15,535.72

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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.