Home / 205,540.40-308,080.20-87,191.60

Finding the Fourth Proportional to 205,540.40, 308,080.20 and 87,191.60

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Solution

The fourth proportional to 205,540.40, 308,080.20 and 87,191.60 is: 130,689.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,540.40 : 308,080.20 = 87,191.60 : x
  2. Step 2: Convert to fraction form
    205,540.40/308,080.20 = 87,191.60/x
  3. Step 3: Cross multiply
    205,540.40x = 308,080.20 × 87,191.60
  4. Step 4: Simplify right side
    205,540.40x = 26,862,005,566.32
  5. Step 5: Solve for x
    x = 26,862,005,566.32/205,540.40
  6. Step 6: Final answer
    x = 130,689.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.