Home / 20,812.42-28,712.43-13,644.05

Finding the Fourth Proportional to 20,812.42, 28,712.43 and 13,644.05

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Solution

The fourth proportional to 20,812.42, 28,712.43 and 13,644.05 is: 18,823.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.42 : 28,712.43 = 13,644.05 : x
  2. Step 2: Convert to fraction form
    20,812.42/28,712.43 = 13,644.05/x
  3. Step 3: Cross multiply
    20,812.42x = 28,712.43 × 13,644.05
  4. Step 4: Simplify right side
    20,812.42x = 391,753,902.32
  5. Step 5: Solve for x
    x = 391,753,902.32/20,812.42
  6. Step 6: Final answer
    x = 18,823.08

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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.