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Finding the Fourth Proportional to 715,919.92, 987,948.60 and 393,629.68

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Solution

The fourth proportional to 715,919.92, 987,948.60 and 393,629.68 is: 543,197.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,919.92 : 987,948.60 = 393,629.68 : x
  2. Step 2: Convert to fraction form
    715,919.92/987,948.60 = 393,629.68/x
  3. Step 3: Cross multiply
    715,919.92x = 987,948.60 × 393,629.68
  4. Step 4: Simplify right side
    715,919.92x = 388,885,891,274.45
  5. Step 5: Solve for x
    x = 388,885,891,274.45/715,919.92
  6. Step 6: Final answer
    x = 543,197.47

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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.