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Finding the Fourth Proportional to 399,364.89, 550,186.99 and 278,286.49

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Solution

The fourth proportional to 399,364.89, 550,186.99 and 278,286.49 is: 383,382.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,364.89 : 550,186.99 = 278,286.49 : x
  2. Step 2: Convert to fraction form
    399,364.89/550,186.99 = 278,286.49/x
  3. Step 3: Cross multiply
    399,364.89x = 550,186.99 × 278,286.49
  4. Step 4: Simplify right side
    399,364.89x = 153,109,606,290.77
  5. Step 5: Solve for x
    x = 153,109,606,290.77/399,364.89
  6. Step 6: Final answer
    x = 383,382.74

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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.