Home / 20,839.34-28,758.28-11,407.90

Finding the Fourth Proportional to 20,839.34, 28,758.28 and 11,407.90

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Solution

The fourth proportional to 20,839.34, 28,758.28 and 11,407.90 is: 15,742.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,839.34 : 28,758.28 = 11,407.90 : x
  2. Step 2: Convert to fraction form
    20,839.34/28,758.28 = 11,407.90/x
  3. Step 3: Cross multiply
    20,839.34x = 28,758.28 × 11,407.90
  4. Step 4: Simplify right side
    20,839.34x = 328,071,600.09
  5. Step 5: Solve for x
    x = 328,071,600.09/20,839.34
  6. Step 6: Final answer
    x = 15,742.90

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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.