Home / 138,020.80-207,031.20-90,781.60

Finding the Fourth Proportional to 138,020.80, 207,031.20 and 90,781.60

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Solution

The fourth proportional to 138,020.80, 207,031.20 and 90,781.60 is: 136,172.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,020.80 : 207,031.20 = 90,781.60 : x
  2. Step 2: Convert to fraction form
    138,020.80/207,031.20 = 90,781.60/x
  3. Step 3: Cross multiply
    138,020.80x = 207,031.20 × 90,781.60
  4. Step 4: Simplify right side
    138,020.80x = 18,794,623,585.92
  5. Step 5: Solve for x
    x = 18,794,623,585.92/138,020.80
  6. Step 6: Final answer
    x = 136,172.40

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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.