Home / 20,340.80-28,071.36-11,387.77

Finding the Fourth Proportional to 20,340.80, 28,071.36 and 11,387.77

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Solution

The fourth proportional to 20,340.80, 28,071.36 and 11,387.77 is: 15,715.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,340.80 : 28,071.36 = 11,387.77 : x
  2. Step 2: Convert to fraction form
    20,340.80/28,071.36 = 11,387.77/x
  3. Step 3: Cross multiply
    20,340.80x = 28,071.36 × 11,387.77
  4. Step 4: Simplify right side
    20,340.80x = 319,670,191.27
  5. Step 5: Solve for x
    x = 319,670,191.27/20,340.80
  6. Step 6: Final answer
    x = 15,715.71

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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.