Home / 20,888.99-31,326.19-8,405.78

Finding the Fourth Proportional to 20,888.99, 31,326.19 and 8,405.78

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Solution

The fourth proportional to 20,888.99, 31,326.19 and 8,405.78 is: 12,605.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,888.99 : 31,326.19 = 8,405.78 : x
  2. Step 2: Convert to fraction form
    20,888.99/31,326.19 = 8,405.78/x
  3. Step 3: Cross multiply
    20,888.99x = 31,326.19 × 8,405.78
  4. Step 4: Simplify right side
    20,888.99x = 263,320,862.72
  5. Step 5: Solve for x
    x = 263,320,862.72/20,888.99
  6. Step 6: Final answer
    x = 12,605.72

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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.