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Finding the Fourth Proportional to 721,920.52, 996,238.26 and 399,623.80

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Solution

The fourth proportional to 721,920.52, 996,238.26 and 399,623.80 is: 551,474.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,920.52 : 996,238.26 = 399,623.80 : x
  2. Step 2: Convert to fraction form
    721,920.52/996,238.26 = 399,623.80/x
  3. Step 3: Cross multiply
    721,920.52x = 996,238.26 × 399,623.80
  4. Step 4: Simplify right side
    721,920.52x = 398,120,519,166.59
  5. Step 5: Solve for x
    x = 398,120,519,166.59/721,920.52
  6. Step 6: Final answer
    x = 551,474.17

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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.