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Finding the Fourth Proportional to 718,826.40, 991,978.25 and 396,571.95

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Solution

The fourth proportional to 718,826.40, 991,978.25 and 396,571.95 is: 547,268.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,826.40 : 991,978.25 = 396,571.95 : x
  2. Step 2: Convert to fraction form
    718,826.40/991,978.25 = 396,571.95/x
  3. Step 3: Cross multiply
    718,826.40x = 991,978.25 × 396,571.95
  4. Step 4: Simplify right side
    718,826.40x = 393,390,746,977.23
  5. Step 5: Solve for x
    x = 393,390,746,977.23/718,826.40
  6. Step 6: Final answer
    x = 547,268.08

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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.