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Finding the Fourth Proportional to 721,638,185.64, 995,860,695.89 and 391,613,324.64

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Solution

The fourth proportional to 721,638,185.64, 995,860,695.89 and 391,613,324.64 is: 540,426,387.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,638,185.64 : 995,860,695.89 = 391,613,324.64 : x
  2. Step 2: Convert to fraction form
    721,638,185.64/995,860,695.89 = 391,613,324.64/x
  3. Step 3: Cross multiply
    721,638,185.64x = 995,860,695.89 × 391,613,324.64
  4. Step 4: Simplify right side
    721,638,185.64x = 389,992,317,993,041,408
  5. Step 5: Solve for x
    x = 389,992,317,993,041,408/721,638,185.64
  6. Step 6: Final answer
    x = 540,426,387.84

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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.