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Finding the Fourth Proportional to 721,459.84, 995,643.94 and 399,164.72

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Solution

The fourth proportional to 721,459.84, 995,643.94 and 399,164.72 is: 550,863.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,459.84 : 995,643.94 = 399,164.72 : x
  2. Step 2: Convert to fraction form
    721,459.84/995,643.94 = 399,164.72/x
  3. Step 3: Cross multiply
    721,459.84x = 995,643.94 × 399,164.72
  4. Step 4: Simplify right side
    721,459.84x = 397,425,934,529.80
  5. Step 5: Solve for x
    x = 397,425,934,529.80/721,459.84
  6. Step 6: Final answer
    x = 550,863.56

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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.