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Finding the Fourth Proportional to 687,047.70, 948,131.52 and 381,144.15

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Solution

The fourth proportional to 687,047.70, 948,131.52 and 381,144.15 is: 525,982.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,047.70 : 948,131.52 = 381,144.15 : x
  2. Step 2: Convert to fraction form
    687,047.70/948,131.52 = 381,144.15/x
  3. Step 3: Cross multiply
    687,047.70x = 948,131.52 × 381,144.15
  4. Step 4: Simplify right side
    687,047.70x = 361,374,782,278.61
  5. Step 5: Solve for x
    x = 361,374,782,278.61/687,047.70
  6. Step 6: Final answer
    x = 525,982.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.