Home / 15,855.16-21,879.90-9,140.80

Finding the Fourth Proportional to 15,855.16, 21,879.90 and 9,140.80

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Solution

The fourth proportional to 15,855.16, 21,879.90 and 9,140.80 is: 12,614.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.16 : 21,879.90 = 9,140.80 : x
  2. Step 2: Convert to fraction form
    15,855.16/21,879.90 = 9,140.80/x
  3. Step 3: Cross multiply
    15,855.16x = 21,879.90 × 9,140.80
  4. Step 4: Simplify right side
    15,855.16x = 199,999,789.92
  5. Step 5: Solve for x
    x = 199,999,789.92/15,855.16
  6. Step 6: Final answer
    x = 12,614.18

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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.