Home / 20,761.45-28,655.47-13,587.20

Finding the Fourth Proportional to 20,761.45, 28,655.47 and 13,587.20

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Solution

The fourth proportional to 20,761.45, 28,655.47 and 13,587.20 is: 18,753.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.45 : 28,655.47 = 13,587.20 : x
  2. Step 2: Convert to fraction form
    20,761.45/28,655.47 = 13,587.20/x
  3. Step 3: Cross multiply
    20,761.45x = 28,655.47 × 13,587.20
  4. Step 4: Simplify right side
    20,761.45x = 389,347,506.72
  5. Step 5: Solve for x
    x = 389,347,506.72/20,761.45
  6. Step 6: Final answer
    x = 18,753.39

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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.