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Finding the Fourth Proportional to 721,886.94, 996,191.89 and 399,590.10

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Solution

The fourth proportional to 721,886.94, 996,191.89 and 399,590.10 is: 551,427.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,886.94 : 996,191.89 = 399,590.10 : x
  2. Step 2: Convert to fraction form
    721,886.94/996,191.89 = 399,590.10/x
  3. Step 3: Cross multiply
    721,886.94x = 996,191.89 × 399,590.10
  4. Step 4: Simplify right side
    721,886.94x = 398,068,415,945.31
  5. Step 5: Solve for x
    x = 398,068,415,945.31/721,886.94
  6. Step 6: Final answer
    x = 551,427.65

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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.