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Finding the Fourth Proportional to 138,059.40, 207,117.90 and 78,846.60

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Solution

The fourth proportional to 138,059.40, 207,117.90 and 78,846.60 is: 118,286.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,059.40 : 207,117.90 = 78,846.60 : x
  2. Step 2: Convert to fraction form
    138,059.40/207,117.90 = 78,846.60/x
  3. Step 3: Cross multiply
    138,059.40x = 207,117.90 × 78,846.60
  4. Step 4: Simplify right side
    138,059.40x = 16,330,542,214.14
  5. Step 5: Solve for x
    x = 16,330,542,214.14/138,059.40
  6. Step 6: Final answer
    x = 118,286.35

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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.