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Finding the Fourth Proportional to 138,023.80, 207,035.70 and 90,784.60

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Solution

The fourth proportional to 138,023.80, 207,035.70 and 90,784.60 is: 136,176.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,023.80 : 207,035.70 = 90,784.60 : x
  2. Step 2: Convert to fraction form
    138,023.80/207,035.70 = 90,784.60/x
  3. Step 3: Cross multiply
    138,023.80x = 207,035.70 × 90,784.60
  4. Step 4: Simplify right side
    138,023.80x = 18,795,653,210.22
  5. Step 5: Solve for x
    x = 18,795,653,210.22/138,023.80
  6. Step 6: Final answer
    x = 136,176.90

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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.