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Finding the Fourth Proportional to 72,872.21, 100,570.82 and 42,655.70

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Solution

The fourth proportional to 72,872.21, 100,570.82 and 42,655.70 is: 58,869.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,872.21 : 100,570.82 = 42,655.70 : x
  2. Step 2: Convert to fraction form
    72,872.21/100,570.82 = 42,655.70/x
  3. Step 3: Cross multiply
    72,872.21x = 100,570.82 × 42,655.70
  4. Step 4: Simplify right side
    72,872.21x = 4,289,918,010.54
  5. Step 5: Solve for x
    x = 4,289,918,010.54/72,872.21
  6. Step 6: Final answer
    x = 58,869.06

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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.