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Finding the Fourth Proportional to 112,168.78, 154,792.20 and 61,867.78

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Solution

The fourth proportional to 112,168.78, 154,792.20 and 61,867.78 is: 85,377.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,168.78 : 154,792.20 = 61,867.78 : x
  2. Step 2: Convert to fraction form
    112,168.78/154,792.20 = 61,867.78/x
  3. Step 3: Cross multiply
    112,168.78x = 154,792.20 × 61,867.78
  4. Step 4: Simplify right side
    112,168.78x = 9,576,649,775.32
  5. Step 5: Solve for x
    x = 9,576,649,775.32/112,168.78
  6. Step 6: Final answer
    x = 85,377.14

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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.