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Finding the Fourth Proportional to 136,976.40, 205,810.20 and 87,080.40

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Solution

The fourth proportional to 136,976.40, 205,810.20 and 87,080.40 is: 130,840.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,976.40 : 205,810.20 = 87,080.40 : x
  2. Step 2: Convert to fraction form
    136,976.40/205,810.20 = 87,080.40/x
  3. Step 3: Cross multiply
    136,976.40x = 205,810.20 × 87,080.40
  4. Step 4: Simplify right side
    136,976.40x = 17,922,034,540.08
  5. Step 5: Solve for x
    x = 17,922,034,540.08/136,976.40
  6. Step 6: Final answer
    x = 130,840.31

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1.5x scale

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.