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Finding the Fourth Proportional to 721,640.16, 995,838.90 and 399,363.84

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Solution

The fourth proportional to 721,640.16, 995,838.90 and 399,363.84 is: 551,108.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,640.16 : 995,838.90 = 399,363.84 : x
  2. Step 2: Convert to fraction form
    721,640.16/995,838.90 = 399,363.84/x
  3. Step 3: Cross multiply
    721,640.16x = 995,838.90 × 399,363.84
  4. Step 4: Simplify right side
    721,640.16x = 397,702,047,125.38
  5. Step 5: Solve for x
    x = 397,702,047,125.38/721,640.16
  6. Step 6: Final answer
    x = 551,108.53

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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.