Home / 721,320.12-995,427.90-399,040.56

Finding the Fourth Proportional to 721,320.12, 995,427.90 and 399,040.56

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Solution

The fourth proportional to 721,320.12, 995,427.90 and 399,040.56 is: 550,679.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,320.12 : 995,427.90 = 399,040.56 : x
  2. Step 2: Convert to fraction form
    721,320.12/995,427.90 = 399,040.56/x
  3. Step 3: Cross multiply
    721,320.12x = 995,427.90 × 399,040.56
  4. Step 4: Simplify right side
    721,320.12x = 397,216,106,655.62
  5. Step 5: Solve for x
    x = 397,216,106,655.62/721,320.12
  6. Step 6: Final answer
    x = 550,679.37

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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.