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Finding the Fourth Proportional to 137,187.98, 206,810.21 and 128,043.59

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Solution

The fourth proportional to 137,187.98, 206,810.21 and 128,043.59 is: 193,025.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,187.98 : 206,810.21 = 128,043.59 : x
  2. Step 2: Convert to fraction form
    137,187.98/206,810.21 = 128,043.59/x
  3. Step 3: Cross multiply
    137,187.98x = 206,810.21 × 128,043.59
  4. Step 4: Simplify right side
    137,187.98x = 26,480,720,062.78
  5. Step 5: Solve for x
    x = 26,480,720,062.78/137,187.98
  6. Step 6: Final answer
    x = 193,025.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.