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Finding the Fourth Proportional to 399,216.89, 599,138.18 and 278,488.57

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Solution

The fourth proportional to 399,216.89, 599,138.18 and 278,488.57 is: 417,951.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,216.89 : 599,138.18 = 278,488.57 : x
  2. Step 2: Convert to fraction form
    399,216.89/599,138.18 = 278,488.57/x
  3. Step 3: Cross multiply
    399,216.89x = 599,138.18 × 278,488.57
  4. Step 4: Simplify right side
    399,216.89x = 166,853,130,592.47
  5. Step 5: Solve for x
    x = 166,853,130,592.47/399,216.89
  6. Step 6: Final answer
    x = 417,951.08

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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.