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Finding the Fourth Proportional to 715,753.12, 987,738.96 and 393,484

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Solution

The fourth proportional to 715,753.12, 987,738.96 and 393,484 is: 543,007.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,753.12 : 987,738.96 = 393,484 : x
  2. Step 2: Convert to fraction form
    715,753.12/987,738.96 = 393,484/x
  3. Step 3: Cross multiply
    715,753.12x = 987,738.96 × 393,484
  4. Step 4: Simplify right side
    715,753.12x = 388,659,476,936.64
  5. Step 5: Solve for x
    x = 388,659,476,936.64/715,753.12
  6. Step 6: Final answer
    x = 543,007.73

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1.5x scale

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.