Home / 21,033.60-31,550.40-12,139.80

Finding the Fourth Proportional to 21,033.60, 31,550.40 and 12,139.80

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Solution

The fourth proportional to 21,033.60, 31,550.40 and 12,139.80 is: 18,209.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,033.60 : 31,550.40 = 12,139.80 : x
  2. Step 2: Convert to fraction form
    21,033.60/31,550.40 = 12,139.80/x
  3. Step 3: Cross multiply
    21,033.60x = 31,550.40 × 12,139.80
  4. Step 4: Simplify right side
    21,033.60x = 383,015,545.92
  5. Step 5: Solve for x
    x = 383,015,545.92/21,033.60
  6. Step 6: Final answer
    x = 18,209.70

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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.