Home / 12,545.22-18,815.40-11,920.80

Finding the Fourth Proportional to 12,545.22, 18,815.40 and 11,920.80

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Solution

The fourth proportional to 12,545.22, 18,815.40 and 11,920.80 is: 17,878.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,545.22 : 18,815.40 = 11,920.80 : x
  2. Step 2: Convert to fraction form
    12,545.22/18,815.40 = 11,920.80/x
  3. Step 3: Cross multiply
    12,545.22x = 18,815.40 × 11,920.80
  4. Step 4: Simplify right side
    12,545.22x = 224,294,620.32
  5. Step 5: Solve for x
    x = 224,294,620.32/12,545.22
  6. Step 6: Final answer
    x = 17,878.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.