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Finding the Fourth Proportional to 721,618.66, 996,656.16 and 491,779.54

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Solution

The fourth proportional to 721,618.66, 996,656.16 and 491,779.54 is: 679,216.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,618.66 : 996,656.16 = 491,779.54 : x
  2. Step 2: Convert to fraction form
    721,618.66/996,656.16 = 491,779.54/x
  3. Step 3: Cross multiply
    721,618.66x = 996,656.16 × 491,779.54
  4. Step 4: Simplify right side
    721,618.66x = 490,135,107,902.97
  5. Step 5: Solve for x
    x = 490,135,107,902.97/721,618.66
  6. Step 6: Final answer
    x = 679,216.23

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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.