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Finding the Fourth Proportional to 721,661.20, 995,867.88 and 399,384.88

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Solution

The fourth proportional to 721,661.20, 995,867.88 and 399,384.88 is: 551,137.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,661.20 : 995,867.88 = 399,384.88 : x
  2. Step 2: Convert to fraction form
    721,661.20/995,867.88 = 399,384.88/x
  3. Step 3: Cross multiply
    721,661.20x = 995,867.88 × 399,384.88
  4. Step 4: Simplify right side
    721,661.20x = 397,734,573,749.65
  5. Step 5: Solve for x
    x = 397,734,573,749.65/721,661.20
  6. Step 6: Final answer
    x = 551,137.53

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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.