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Finding the Fourth Proportional to 715,909.16, 987,928.07 and 393,600.04

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Solution

The fourth proportional to 715,909.16, 987,928.07 and 393,600.04 is: 543,153.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,909.16 : 987,928.07 = 393,600.04 : x
  2. Step 2: Convert to fraction form
    715,909.16/987,928.07 = 393,600.04/x
  3. Step 3: Cross multiply
    715,909.16x = 987,928.07 × 393,600.04
  4. Step 4: Simplify right side
    715,909.16x = 388,848,527,869.12
  5. Step 5: Solve for x
    x = 388,848,527,869.12/715,909.16
  6. Step 6: Final answer
    x = 543,153.45

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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.