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Finding the Fourth Proportional to 721,518.72, 995,697 and 399,242.40

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Solution

The fourth proportional to 721,518.72, 995,697 and 399,242.40 is: 550,955.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,518.72 : 995,697 = 399,242.40 : x
  2. Step 2: Convert to fraction form
    721,518.72/995,697 = 399,242.40/x
  3. Step 3: Cross multiply
    721,518.72x = 995,697 × 399,242.40
  4. Step 4: Simplify right side
    721,518.72x = 397,524,459,952.80
  5. Step 5: Solve for x
    x = 397,524,459,952.80/721,518.72
  6. Step 6: Final answer
    x = 550,955.16

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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.