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Finding the Fourth Proportional to 721,639.66, 995,838.21 and 399,363.34

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Solution

The fourth proportional to 721,639.66, 995,838.21 and 399,363.34 is: 551,107.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,639.66 : 995,838.21 = 399,363.34 : x
  2. Step 2: Convert to fraction form
    721,639.66/995,838.21 = 399,363.34/x
  3. Step 3: Cross multiply
    721,639.66x = 995,838.21 × 399,363.34
  4. Step 4: Simplify right side
    721,639.66x = 397,701,273,645.22
  5. Step 5: Solve for x
    x = 397,701,273,645.22/721,639.66
  6. Step 6: Final answer
    x = 551,107.84

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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.