Home / 100,211.22-138,257.16-57,159.78

Finding the Fourth Proportional to 100,211.22, 138,257.16 and 57,159.78

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Solution

The fourth proportional to 100,211.22, 138,257.16 and 57,159.78 is: 78,860.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,211.22 : 138,257.16 = 57,159.78 : x
  2. Step 2: Convert to fraction form
    100,211.22/138,257.16 = 57,159.78/x
  3. Step 3: Cross multiply
    100,211.22x = 138,257.16 × 57,159.78
  4. Step 4: Simplify right side
    100,211.22x = 7,902,748,849.02
  5. Step 5: Solve for x
    x = 7,902,748,849.02/100,211.22
  6. Step 6: Final answer
    x = 78,860.92

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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.