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Finding the Fourth Proportional to 715,496.72, 987,403.66 and 393,215

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Solution

The fourth proportional to 715,496.72, 987,403.66 and 393,215 is: 542,646.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,496.72 : 987,403.66 = 393,215 : x
  2. Step 2: Convert to fraction form
    715,496.72/987,403.66 = 393,215/x
  3. Step 3: Cross multiply
    715,496.72x = 987,403.66 × 393,215
  4. Step 4: Simplify right side
    715,496.72x = 388,261,930,166.90
  5. Step 5: Solve for x
    x = 388,261,930,166.90/715,496.72
  6. Step 6: Final answer
    x = 542,646.69

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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.