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Finding the Fourth Proportional to 721,301.45, 995,309.87 and 398,967.71

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Solution

The fourth proportional to 721,301.45, 995,309.87 and 398,967.71 is: 550,527.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,301.45 : 995,309.87 = 398,967.71 : x
  2. Step 2: Convert to fraction form
    721,301.45/995,309.87 = 398,967.71/x
  3. Step 3: Cross multiply
    721,301.45x = 995,309.87 × 398,967.71
  4. Step 4: Simplify right side
    721,301.45x = 397,096,492,602.91
  5. Step 5: Solve for x
    x = 397,096,492,602.91/721,301.45
  6. Step 6: Final answer
    x = 550,527.79

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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.