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Finding the Fourth Proportional to 155,043.16, 213,961.02 and 87,969.88

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Solution

The fourth proportional to 155,043.16, 213,961.02 and 87,969.88 is: 121,399.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,043.16 : 213,961.02 = 87,969.88 : x
  2. Step 2: Convert to fraction form
    155,043.16/213,961.02 = 87,969.88/x
  3. Step 3: Cross multiply
    155,043.16x = 213,961.02 × 87,969.88
  4. Step 4: Simplify right side
    155,043.16x = 18,822,125,254.08
  5. Step 5: Solve for x
    x = 18,822,125,254.08/155,043.16
  6. Step 6: Final answer
    x = 121,399.26

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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.