Home / 20,398.70-28,178.88-15,742.82

Finding the Fourth Proportional to 20,398.70, 28,178.88 and 15,742.82

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Solution

The fourth proportional to 20,398.70, 28,178.88 and 15,742.82 is: 21,747.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,398.70 : 28,178.88 = 15,742.82 : x
  2. Step 2: Convert to fraction form
    20,398.70/28,178.88 = 15,742.82/x
  3. Step 3: Cross multiply
    20,398.70x = 28,178.88 × 15,742.82
  4. Step 4: Simplify right side
    20,398.70x = 443,615,035.64
  5. Step 5: Solve for x
    x = 443,615,035.64/20,398.70
  6. Step 6: Final answer
    x = 21,747.22

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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.