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Finding the Fourth Proportional to 718,836.78, 991,991.94 and 396,566.94

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Solution

The fourth proportional to 718,836.78, 991,991.94 and 396,566.94 is: 547,260.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,836.78 : 991,991.94 = 396,566.94 : x
  2. Step 2: Convert to fraction form
    718,836.78/991,991.94 = 396,566.94/x
  3. Step 3: Cross multiply
    718,836.78x = 991,991.94 × 396,566.94
  4. Step 4: Simplify right side
    718,836.78x = 393,391,208,150.46
  5. Step 5: Solve for x
    x = 393,391,208,150.46/718,836.78
  6. Step 6: Final answer
    x = 547,260.82

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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.