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Finding the Fourth Proportional to 381,708.40, 572,416.80 and 115,380.40

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Solution

The fourth proportional to 381,708.40, 572,416.80 and 115,380.40 is: 173,026.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,708.40 : 572,416.80 = 115,380.40 : x
  2. Step 2: Convert to fraction form
    381,708.40/572,416.80 = 115,380.40/x
  3. Step 3: Cross multiply
    381,708.40x = 572,416.80 × 115,380.40
  4. Step 4: Simplify right side
    381,708.40x = 66,045,679,350.72
  5. Step 5: Solve for x
    x = 66,045,679,350.72/381,708.40
  6. Step 6: Final answer
    x = 173,026.53

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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.