Home / 20,529.60-28,320.78-12,972.30

Finding the Fourth Proportional to 20,529.60, 28,320.78 and 12,972.30

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Solution

The fourth proportional to 20,529.60, 28,320.78 and 12,972.30 is: 17,895.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,529.60 : 28,320.78 = 12,972.30 : x
  2. Step 2: Convert to fraction form
    20,529.60/28,320.78 = 12,972.30/x
  3. Step 3: Cross multiply
    20,529.60x = 28,320.78 × 12,972.30
  4. Step 4: Simplify right side
    20,529.60x = 367,385,654.39
  5. Step 5: Solve for x
    x = 367,385,654.39/20,529.60
  6. Step 6: Final answer
    x = 17,895.41

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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.