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Finding the Fourth Proportional to 715,883.55, 987,894.05 and 393,591.17

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Solution

The fourth proportional to 715,883.55, 987,894.05 and 393,591.17 is: 543,141.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,883.55 : 987,894.05 = 393,591.17 : x
  2. Step 2: Convert to fraction form
    715,883.55/987,894.05 = 393,591.17/x
  3. Step 3: Cross multiply
    715,883.55x = 987,894.05 × 393,591.17
  4. Step 4: Simplify right side
    715,883.55x = 388,826,368,068.11
  5. Step 5: Solve for x
    x = 388,826,368,068.11/715,883.55
  6. Step 6: Final answer
    x = 543,141.92

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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.