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Finding the Fourth Proportional to 721,272.60, 995,350.14 and 398,979

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Solution

The fourth proportional to 721,272.60, 995,350.14 and 398,979 is: 550,587.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,272.60 : 995,350.14 = 398,979 : x
  2. Step 2: Convert to fraction form
    721,272.60/995,350.14 = 398,979/x
  3. Step 3: Cross multiply
    721,272.60x = 995,350.14 × 398,979
  4. Step 4: Simplify right side
    721,272.60x = 397,123,803,507.06
  5. Step 5: Solve for x
    x = 397,123,803,507.06/721,272.60
  6. Step 6: Final answer
    x = 550,587.67

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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.