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Finding the Fourth Proportional to 715,859.28, 987,892.56 and 393,571.62

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Solution

The fourth proportional to 715,859.28, 987,892.56 and 393,571.62 is: 543,132.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,859.28 : 987,892.56 = 393,571.62 : x
  2. Step 2: Convert to fraction form
    715,859.28/987,892.56 = 393,571.62/x
  3. Step 3: Cross multiply
    715,859.28x = 987,892.56 × 393,571.62
  4. Step 4: Simplify right side
    715,859.28x = 388,806,475,225.15
  5. Step 5: Solve for x
    x = 388,806,475,225.15/715,859.28
  6. Step 6: Final answer
    x = 543,132.55

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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.