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Finding the Fourth Proportional to 721,638,187.64, 995,860,698.66 and 391,613,326.64

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Solution

The fourth proportional to 721,638,187.64, 995,860,698.66 and 391,613,326.64 is: 540,426,390.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,638,187.64 : 995,860,698.66 = 391,613,326.64 : x
  2. Step 2: Convert to fraction form
    721,638,187.64/995,860,698.66 = 391,613,326.64/x
  3. Step 3: Cross multiply
    721,638,187.64x = 995,860,698.66 × 391,613,326.64
  4. Step 4: Simplify right side
    721,638,187.64x = 389,992,321,072,277,184
  5. Step 5: Solve for x
    x = 389,992,321,072,277,184/721,638,187.64
  6. Step 6: Final answer
    x = 540,426,390.61

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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.