Home / 20,387.16-28,150.20-13,220.52

Finding the Fourth Proportional to 20,387.16, 28,150.20 and 13,220.52

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Solution

The fourth proportional to 20,387.16, 28,150.20 and 13,220.52 is: 18,254.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.16 : 28,150.20 = 13,220.52 : x
  2. Step 2: Convert to fraction form
    20,387.16/28,150.20 = 13,220.52/x
  3. Step 3: Cross multiply
    20,387.16x = 28,150.20 × 13,220.52
  4. Step 4: Simplify right side
    20,387.16x = 372,160,282.10
  5. Step 5: Solve for x
    x = 372,160,282.10/20,387.16
  6. Step 6: Final answer
    x = 18,254.64

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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.