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Finding the Fourth Proportional to 721,641.16, 995,840.28 and 399,364.84

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Solution

The fourth proportional to 721,641.16, 995,840.28 and 399,364.84 is: 551,109.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,641.16 : 995,840.28 = 399,364.84 : x
  2. Step 2: Convert to fraction form
    721,641.16/995,840.28 = 399,364.84/x
  3. Step 3: Cross multiply
    721,641.16x = 995,840.28 × 399,364.84
  4. Step 4: Simplify right side
    721,641.16x = 397,703,594,087.76
  5. Step 5: Solve for x
    x = 397,703,594,087.76/721,641.16
  6. Step 6: Final answer
    x = 551,109.91

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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.