Home / 20,386.90-28,135.13-11,434.90

Finding the Fourth Proportional to 20,386.90, 28,135.13 and 11,434.90

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Solution

The fourth proportional to 20,386.90, 28,135.13 and 11,434.90 is: 15,780.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,386.90 : 28,135.13 = 11,434.90 : x
  2. Step 2: Convert to fraction form
    20,386.90/28,135.13 = 11,434.90/x
  3. Step 3: Cross multiply
    20,386.90x = 28,135.13 × 11,434.90
  4. Step 4: Simplify right side
    20,386.90x = 321,722,398.04
  5. Step 5: Solve for x
    x = 321,722,398.04/20,386.90
  6. Step 6: Final answer
    x = 15,780.84

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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.