Home / 20,390.40-28,139.76-11,437.44

Finding the Fourth Proportional to 20,390.40, 28,139.76 and 11,437.44

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Solution

The fourth proportional to 20,390.40, 28,139.76 and 11,437.44 is: 15,784.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.40 : 28,139.76 = 11,437.44 : x
  2. Step 2: Convert to fraction form
    20,390.40/28,139.76 = 11,437.44/x
  3. Step 3: Cross multiply
    20,390.40x = 28,139.76 × 11,437.44
  4. Step 4: Simplify right side
    20,390.40x = 321,846,816.61
  5. Step 5: Solve for x
    x = 321,846,816.61/20,390.40
  6. Step 6: Final answer
    x = 15,784.23

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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.