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Finding the Fourth Proportional to 721,644.14, 995,870.86 and 399,376.46

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Solution

The fourth proportional to 721,644.14, 995,870.86 and 399,376.46 is: 551,140.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,644.14 : 995,870.86 = 399,376.46 : x
  2. Step 2: Convert to fraction form
    721,644.14/995,870.86 = 399,376.46/x
  3. Step 3: Cross multiply
    721,644.14x = 995,870.86 × 399,376.46
  4. Step 4: Simplify right side
    721,644.14x = 397,727,378,683.96
  5. Step 5: Solve for x
    x = 397,727,378,683.96/721,644.14
  6. Step 6: Final answer
    x = 551,140.59

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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.