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Finding the Fourth Proportional to 715,825, 987,813.33 and 393,532.75

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Solution

The fourth proportional to 715,825, 987,813.33 and 393,532.75 is: 543,061.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,825 : 987,813.33 = 393,532.75 : x
  2. Step 2: Convert to fraction form
    715,825/987,813.33 = 393,532.75/x
  3. Step 3: Cross multiply
    715,825x = 987,813.33 × 393,532.75
  4. Step 4: Simplify right side
    715,825x = 388,736,896,241.56
  5. Step 5: Solve for x
    x = 388,736,896,241.56/715,825
  6. Step 6: Final answer
    x = 543,061.36

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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.