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Finding the Fourth Proportional to 124,626.40, 186,939.60 and 72,138.40

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Solution

The fourth proportional to 124,626.40, 186,939.60 and 72,138.40 is: 108,207.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,626.40 : 186,939.60 = 72,138.40 : x
  2. Step 2: Convert to fraction form
    124,626.40/186,939.60 = 72,138.40/x
  3. Step 3: Cross multiply
    124,626.40x = 186,939.60 × 72,138.40
  4. Step 4: Simplify right side
    124,626.40x = 13,485,523,640.64
  5. Step 5: Solve for x
    x = 13,485,523,640.64/124,626.40
  6. Step 6: Final answer
    x = 108,207.60

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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.