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Finding the Fourth Proportional to 715,856.58, 987,899.52 and 393,572.94

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Solution

The fourth proportional to 715,856.58, 987,899.52 and 393,572.94 is: 543,140.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,856.58 : 987,899.52 = 393,572.94 : x
  2. Step 2: Convert to fraction form
    715,856.58/987,899.52 = 393,572.94/x
  3. Step 3: Cross multiply
    715,856.58x = 987,899.52 × 393,572.94
  4. Step 4: Simplify right side
    715,856.58x = 388,810,518,510.99
  5. Step 5: Solve for x
    x = 388,810,518,510.99/715,856.58
  6. Step 6: Final answer
    x = 543,140.25

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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.