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Finding the Fourth Proportional to 57,780.78, 86,671.20 and 20,844.78

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Solution

The fourth proportional to 57,780.78, 86,671.20 and 20,844.78 is: 31,267.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,780.78 : 86,671.20 = 20,844.78 : x
  2. Step 2: Convert to fraction form
    57,780.78/86,671.20 = 20,844.78/x
  3. Step 3: Cross multiply
    57,780.78x = 86,671.20 × 20,844.78
  4. Step 4: Simplify right side
    57,780.78x = 1,806,642,096.34
  5. Step 5: Solve for x
    x = 1,806,642,096.34/57,780.78
  6. Step 6: Final answer
    x = 31,267.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.