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Finding the Fourth Proportional to 721,289.64, 995,359.68 and 399,013.32

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Solution

The fourth proportional to 721,289.64, 995,359.68 and 399,013.32 is: 550,627.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,289.64 : 995,359.68 = 399,013.32 : x
  2. Step 2: Convert to fraction form
    721,289.64/995,359.68 = 399,013.32/x
  3. Step 3: Cross multiply
    721,289.64x = 995,359.68 × 399,013.32
  4. Step 4: Simplify right side
    721,289.64x = 397,161,770,510.94
  5. Step 5: Solve for x
    x = 397,161,770,510.94/721,289.64
  6. Step 6: Final answer
    x = 550,627.30

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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.