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Finding the Fourth Proportional to 721,319.34, 995,450.01 and 399,023.88

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Solution

The fourth proportional to 721,319.34, 995,450.01 and 399,023.88 is: 550,669.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,319.34 : 995,450.01 = 399,023.88 : x
  2. Step 2: Convert to fraction form
    721,319.34/995,450.01 = 399,023.88/x
  3. Step 3: Cross multiply
    721,319.34x = 995,450.01 × 399,023.88
  4. Step 4: Simplify right side
    721,319.34x = 397,208,325,336.24
  5. Step 5: Solve for x
    x = 397,208,325,336.24/721,319.34
  6. Step 6: Final answer
    x = 550,669.17

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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.