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Finding the Fourth Proportional to 721,642.39, 995,868.44 and 399,374.71

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Solution

The fourth proportional to 721,642.39, 995,868.44 and 399,374.71 is: 551,138.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,642.39 : 995,868.44 = 399,374.71 : x
  2. Step 2: Convert to fraction form
    721,642.39/995,868.44 = 399,374.71/x
  3. Step 3: Cross multiply
    721,642.39x = 995,868.44 × 399,374.71
  4. Step 4: Simplify right side
    721,642.39x = 397,724,669,423.15
  5. Step 5: Solve for x
    x = 397,724,669,423.15/721,642.39
  6. Step 6: Final answer
    x = 551,138.17

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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.