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Finding the Fourth Proportional to 721,979.67, 996,300.55 and 399,670.54

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Solution

The fourth proportional to 721,979.67, 996,300.55 and 399,670.54 is: 551,527.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,979.67 : 996,300.55 = 399,670.54 : x
  2. Step 2: Convert to fraction form
    721,979.67/996,300.55 = 399,670.54/x
  3. Step 3: Cross multiply
    721,979.67x = 996,300.55 × 399,670.54
  4. Step 4: Simplify right side
    721,979.67x = 398,191,977,821.62
  5. Step 5: Solve for x
    x = 398,191,977,821.62/721,979.67
  6. Step 6: Final answer
    x = 551,527.97

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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.