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Finding the Fourth Proportional to 138,629.40, 207,798.30 and 79,337.40

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Solution

The fourth proportional to 138,629.40, 207,798.30 and 79,337.40 is: 118,922.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,629.40 : 207,798.30 = 79,337.40 : x
  2. Step 2: Convert to fraction form
    138,629.40/207,798.30 = 79,337.40/x
  3. Step 3: Cross multiply
    138,629.40x = 207,798.30 × 79,337.40
  4. Step 4: Simplify right side
    138,629.40x = 16,486,176,846.42
  5. Step 5: Solve for x
    x = 16,486,176,846.42/138,629.40
  6. Step 6: Final answer
    x = 118,922.66

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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.