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Finding the Fourth Proportional to 721,440.34, 995,616.98 and 399,145.20

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Solution

The fourth proportional to 721,440.34, 995,616.98 and 399,145.20 is: 550,836.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,440.34 : 995,616.98 = 399,145.20 : x
  2. Step 2: Convert to fraction form
    721,440.34/995,616.98 = 399,145.20/x
  3. Step 3: Cross multiply
    721,440.34x = 995,616.98 × 399,145.20
  4. Step 4: Simplify right side
    721,440.34x = 397,395,731,631.69
  5. Step 5: Solve for x
    x = 397,395,731,631.69/721,440.34
  6. Step 6: Final answer
    x = 550,836.58

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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.