Home / 20,386.20-28,134.30-11,434.32

Finding the Fourth Proportional to 20,386.20, 28,134.30 and 11,434.32

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Solution

The fourth proportional to 20,386.20, 28,134.30 and 11,434.32 is: 15,780.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,386.20 : 28,134.30 = 11,434.32 : x
  2. Step 2: Convert to fraction form
    20,386.20/28,134.30 = 11,434.32/x
  3. Step 3: Cross multiply
    20,386.20x = 28,134.30 × 11,434.32
  4. Step 4: Simplify right side
    20,386.20x = 321,696,589.18
  5. Step 5: Solve for x
    x = 321,696,589.18/20,386.20
  6. Step 6: Final answer
    x = 15,780.12

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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.