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Finding the Fourth Proportional to 715,685.64, 987,635.12 and 393,388.82

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Solution

The fourth proportional to 715,685.64, 987,635.12 and 393,388.82 is: 542,870.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,685.64 : 987,635.12 = 393,388.82 : x
  2. Step 2: Convert to fraction form
    715,685.64/987,635.12 = 393,388.82/x
  3. Step 3: Cross multiply
    715,685.64x = 987,635.12 × 393,388.82
  4. Step 4: Simplify right side
    715,685.64x = 388,524,614,447.36
  5. Step 5: Solve for x
    x = 388,524,614,447.36/715,685.64
  6. Step 6: Final answer
    x = 542,870.49

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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.