Home / 715,678.35-987,619.39-388,983.61

Finding the Fourth Proportional to 715,678.35, 987,619.39 and 388,983.61

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Solution

The fourth proportional to 715,678.35, 987,619.39 and 388,983.61 is: 536,788.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,678.35 : 987,619.39 = 388,983.61 : x
  2. Step 2: Convert to fraction form
    715,678.35/987,619.39 = 388,983.61/x
  3. Step 3: Cross multiply
    715,678.35x = 987,619.39 × 388,983.61
  4. Step 4: Simplify right side
    715,678.35x = 384,167,755,628.20
  5. Step 5: Solve for x
    x = 384,167,755,628.20/715,678.35
  6. Step 6: Final answer
    x = 536,788.29

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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.