Home / 20,820.03-28,731.04-11,387.98

Finding the Fourth Proportional to 20,820.03, 28,731.04 and 11,387.98

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Solution

The fourth proportional to 20,820.03, 28,731.04 and 11,387.98 is: 15,715.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.03 : 28,731.04 = 11,387.98 : x
  2. Step 2: Convert to fraction form
    20,820.03/28,731.04 = 11,387.98/x
  3. Step 3: Cross multiply
    20,820.03x = 28,731.04 × 11,387.98
  4. Step 4: Simplify right side
    20,820.03x = 327,188,508.90
  5. Step 5: Solve for x
    x = 327,188,508.90/20,820.03
  6. Step 6: Final answer
    x = 15,715.08

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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.