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Finding the Fourth Proportional to 721,679.80, 995,903.16 and 399,370.72

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Solution

The fourth proportional to 721,679.80, 995,903.16 and 399,370.72 is: 551,123.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,679.80 : 995,903.16 = 399,370.72 : x
  2. Step 2: Convert to fraction form
    721,679.80/995,903.16 = 399,370.72/x
  3. Step 3: Cross multiply
    721,679.80x = 995,903.16 × 399,370.72
  4. Step 4: Simplify right side
    721,679.80x = 397,734,562,059.48
  5. Step 5: Solve for x
    x = 397,734,562,059.48/721,679.80
  6. Step 6: Final answer
    x = 551,123.31

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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.