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Finding the Fourth Proportional to 138,010.20, 207,015.30 and 137,135.40

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Solution

The fourth proportional to 138,010.20, 207,015.30 and 137,135.40 is: 205,703.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,010.20 : 207,015.30 = 137,135.40 : x
  2. Step 2: Convert to fraction form
    138,010.20/207,015.30 = 137,135.40/x
  3. Step 3: Cross multiply
    138,010.20x = 207,015.30 × 137,135.40
  4. Step 4: Simplify right side
    138,010.20x = 28,389,125,971.62
  5. Step 5: Solve for x
    x = 28,389,125,971.62/138,010.20
  6. Step 6: Final answer
    x = 205,703.10

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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.