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Finding the Fourth Proportional to 138,187.80, 207,281.70 and 95,978.70

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Solution

The fourth proportional to 138,187.80, 207,281.70 and 95,978.70 is: 143,968.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,187.80 : 207,281.70 = 95,978.70 : x
  2. Step 2: Convert to fraction form
    138,187.80/207,281.70 = 95,978.70/x
  3. Step 3: Cross multiply
    138,187.80x = 207,281.70 × 95,978.70
  4. Step 4: Simplify right side
    138,187.80x = 19,894,628,099.79
  5. Step 5: Solve for x
    x = 19,894,628,099.79/138,187.80
  6. Step 6: Final answer
    x = 143,968.05

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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.