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Finding the Fourth Proportional to 318,713.88, 439,239.30 and 298,489.56

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Solution

The fourth proportional to 318,713.88, 439,239.30 and 298,489.56 is: 411,366.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,713.88 : 439,239.30 = 298,489.56 : x
  2. Step 2: Convert to fraction form
    318,713.88/439,239.30 = 298,489.56/x
  3. Step 3: Cross multiply
    318,713.88x = 439,239.30 × 298,489.56
  4. Step 4: Simplify right side
    318,713.88x = 131,108,345,391.71
  5. Step 5: Solve for x
    x = 131,108,345,391.71/318,713.88
  6. Step 6: Final answer
    x = 411,366.91

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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.