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Finding the Fourth Proportional to 153,568.78, 211,921.72 and 85,591.96

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Solution

The fourth proportional to 153,568.78, 211,921.72 and 85,591.96 is: 118,115.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,568.78 : 211,921.72 = 85,591.96 : x
  2. Step 2: Convert to fraction form
    153,568.78/211,921.72 = 85,591.96/x
  3. Step 3: Cross multiply
    153,568.78x = 211,921.72 × 85,591.96
  4. Step 4: Simplify right side
    153,568.78x = 18,138,794,637.59
  5. Step 5: Solve for x
    x = 18,138,794,637.59/153,568.78
  6. Step 6: Final answer
    x = 118,115.12

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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.