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Finding the Fourth Proportional to 721,908.52, 996,221.70 and 399,611.80

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Solution

The fourth proportional to 721,908.52, 996,221.70 and 399,611.80 is: 551,457.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,908.52 : 996,221.70 = 399,611.80 : x
  2. Step 2: Convert to fraction form
    721,908.52/996,221.70 = 399,611.80/x
  3. Step 3: Cross multiply
    721,908.52x = 996,221.70 × 399,611.80
  4. Step 4: Simplify right side
    721,908.52x = 398,101,946,736.06
  5. Step 5: Solve for x
    x = 398,101,946,736.06/721,908.52
  6. Step 6: Final answer
    x = 551,457.61

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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.