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Finding the Fourth Proportional to 715,429.24, 987,280.16 and 393,138.94

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Solution

The fourth proportional to 715,429.24, 987,280.16 and 393,138.94 is: 542,525.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,429.24 : 987,280.16 = 393,138.94 : x
  2. Step 2: Convert to fraction form
    715,429.24/987,280.16 = 393,138.94/x
  3. Step 3: Cross multiply
    715,429.24x = 987,280.16 × 393,138.94
  4. Step 4: Simplify right side
    715,429.24x = 388,138,275,585.43
  5. Step 5: Solve for x
    x = 388,138,275,585.43/715,429.24
  6. Step 6: Final answer
    x = 542,525.04

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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.