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Finding the Fourth Proportional to 715,376.81, 987,219.72 and 393,107.69

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Solution

The fourth proportional to 715,376.81, 987,219.72 and 393,107.69 is: 542,488.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,376.81 : 987,219.72 = 393,107.69 : x
  2. Step 2: Convert to fraction form
    715,376.81/987,219.72 = 393,107.69/x
  3. Step 3: Cross multiply
    715,376.81x = 987,219.72 × 393,107.69
  4. Step 4: Simplify right side
    715,376.81x = 388,083,659,709.44
  5. Step 5: Solve for x
    x = 388,083,659,709.44/715,376.81
  6. Step 6: Final answer
    x = 542,488.46

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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.