Home / 20,810.68-28,720.70-11,380.66

Finding the Fourth Proportional to 20,810.68, 28,720.70 and 11,380.66

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Solution

The fourth proportional to 20,810.68, 28,720.70 and 11,380.66 is: 15,706.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.68 : 28,720.70 = 11,380.66 : x
  2. Step 2: Convert to fraction form
    20,810.68/28,720.70 = 11,380.66/x
  3. Step 3: Cross multiply
    20,810.68x = 28,720.70 × 11,380.66
  4. Step 4: Simplify right side
    20,810.68x = 326,860,521.66
  5. Step 5: Solve for x
    x = 326,860,521.66/20,810.68
  6. Step 6: Final answer
    x = 15,706.38

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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.