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Finding the Fourth Proportional to 399,042.45, 550,690.28 and 217,766.08

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Solution

The fourth proportional to 399,042.45, 550,690.28 and 217,766.08 is: 300,523.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,042.45 : 550,690.28 = 217,766.08 : x
  2. Step 2: Convert to fraction form
    399,042.45/550,690.28 = 217,766.08/x
  3. Step 3: Cross multiply
    399,042.45x = 550,690.28 × 217,766.08
  4. Step 4: Simplify right side
    399,042.45x = 119,921,665,678.97
  5. Step 5: Solve for x
    x = 119,921,665,678.97/399,042.45
  6. Step 6: Final answer
    x = 300,523.58

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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.