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Finding the Fourth Proportional to 721,476.72, 995,639.04 and 399,200.40

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Solution

The fourth proportional to 721,476.72, 995,639.04 and 399,200.40 is: 550,897.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,476.72 : 995,639.04 = 399,200.40 : x
  2. Step 2: Convert to fraction form
    721,476.72/995,639.04 = 399,200.40/x
  3. Step 3: Cross multiply
    721,476.72x = 995,639.04 × 399,200.40
  4. Step 4: Simplify right side
    721,476.72x = 397,459,503,023.62
  5. Step 5: Solve for x
    x = 397,459,503,023.62/721,476.72
  6. Step 6: Final answer
    x = 550,897.20

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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.