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Finding the Fourth Proportional to 718,165.05, 991,067.31 and 391,478.69

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Solution

The fourth proportional to 718,165.05, 991,067.31 and 391,478.69 is: 540,240.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,165.05 : 991,067.31 = 391,478.69 : x
  2. Step 2: Convert to fraction form
    718,165.05/991,067.31 = 391,478.69/x
  3. Step 3: Cross multiply
    718,165.05x = 991,067.31 × 391,478.69
  4. Step 4: Simplify right side
    718,165.05x = 387,981,728,022.51
  5. Step 5: Solve for x
    x = 387,981,728,022.51/718,165.05
  6. Step 6: Final answer
    x = 540,240.33

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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.