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Finding the Fourth Proportional to 399,647.15, 551,757.47 and 260,078.74

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Solution

The fourth proportional to 399,647.15, 551,757.47 and 260,078.74 is: 359,067.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,647.15 : 551,757.47 = 260,078.74 : x
  2. Step 2: Convert to fraction form
    399,647.15/551,757.47 = 260,078.74/x
  3. Step 3: Cross multiply
    399,647.15x = 551,757.47 × 260,078.74
  4. Step 4: Simplify right side
    399,647.15x = 143,500,387,583.19
  5. Step 5: Solve for x
    x = 143,500,387,583.19/399,647.15
  6. Step 6: Final answer
    x = 359,067.71

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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.