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Finding the Fourth Proportional to 721,115.16, 995,133.84 and 398,813.34

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Solution

The fourth proportional to 721,115.16, 995,133.84 and 398,813.34 is: 550,359.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,115.16 : 995,133.84 = 398,813.34 : x
  2. Step 2: Convert to fraction form
    721,115.16/995,133.84 = 398,813.34/x
  3. Step 3: Cross multiply
    721,115.16x = 995,133.84 × 398,813.34
  4. Step 4: Simplify right side
    721,115.16x = 396,872,650,477.43
  5. Step 5: Solve for x
    x = 396,872,650,477.43/721,115.16
  6. Step 6: Final answer
    x = 550,359.60

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Double scale
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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.