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Finding the Fourth Proportional to 715,636.15, 987,585.41 and 388,949.11

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Solution

The fourth proportional to 715,636.15, 987,585.41 and 388,949.11 is: 536,753.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,636.15 : 987,585.41 = 388,949.11 : x
  2. Step 2: Convert to fraction form
    715,636.15/987,585.41 = 388,949.11/x
  3. Step 3: Cross multiply
    715,636.15x = 987,585.41 × 388,949.11
  4. Step 4: Simplify right side
    715,636.15x = 384,120,464,771.89
  5. Step 5: Solve for x
    x = 384,120,464,771.89/715,636.15
  6. Step 6: Final answer
    x = 536,753.86

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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.