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Finding the Fourth Proportional to 138,143.80, 207,369.30 and 85,612.60

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Solution

The fourth proportional to 138,143.80, 207,369.30 and 85,612.60 is: 128,514.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,143.80 : 207,369.30 = 85,612.60 : x
  2. Step 2: Convert to fraction form
    138,143.80/207,369.30 = 85,612.60/x
  3. Step 3: Cross multiply
    138,143.80x = 207,369.30 × 85,612.60
  4. Step 4: Simplify right side
    138,143.80x = 17,753,424,933.18
  5. Step 5: Solve for x
    x = 17,753,424,933.18/138,143.80
  6. Step 6: Final answer
    x = 128,514.09

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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.