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Finding the Fourth Proportional to 721,185.24, 995,168.76 and 398,888.40

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Solution

The fourth proportional to 721,185.24, 995,168.76 and 398,888.40 is: 550,429.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,185.24 : 995,168.76 = 398,888.40 : x
  2. Step 2: Convert to fraction form
    721,185.24/995,168.76 = 398,888.40/x
  3. Step 3: Cross multiply
    721,185.24x = 995,168.76 × 398,888.40
  4. Step 4: Simplify right side
    721,185.24x = 396,961,274,406.38
  5. Step 5: Solve for x
    x = 396,961,274,406.38/721,185.24
  6. Step 6: Final answer
    x = 550,429.01

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Double scale
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Similar ratio
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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.