Home / 20,365.45-28,142.92-15,320.91

Finding the Fourth Proportional to 20,365.45, 28,142.92 and 15,320.91

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Solution

The fourth proportional to 20,365.45, 28,142.92 and 15,320.91 is: 21,171.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,365.45 : 28,142.92 = 15,320.91 : x
  2. Step 2: Convert to fraction form
    20,365.45/28,142.92 = 15,320.91/x
  3. Step 3: Cross multiply
    20,365.45x = 28,142.92 × 15,320.91
  4. Step 4: Simplify right side
    20,365.45x = 431,175,144.46
  5. Step 5: Solve for x
    x = 431,175,144.46/20,365.45
  6. Step 6: Final answer
    x = 21,171.89

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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.