Home / 20,685.12-28,545.50-11,253.72

Finding the Fourth Proportional to 20,685.12, 28,545.50 and 11,253.72

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Solution

The fourth proportional to 20,685.12, 28,545.50 and 11,253.72 is: 15,530.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.12 : 28,545.50 = 11,253.72 : x
  2. Step 2: Convert to fraction form
    20,685.12/28,545.50 = 11,253.72/x
  3. Step 3: Cross multiply
    20,685.12x = 28,545.50 × 11,253.72
  4. Step 4: Simplify right side
    20,685.12x = 321,243,064.26
  5. Step 5: Solve for x
    x = 321,243,064.26/20,685.12
  6. Step 6: Final answer
    x = 15,530.15

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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.