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Finding the Fourth Proportional to 721,237.40, 995,220.42 and 398,903.48

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Solution

The fourth proportional to 721,237.40, 995,220.42 and 398,903.48 is: 550,438.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,237.40 : 995,220.42 = 398,903.48 : x
  2. Step 2: Convert to fraction form
    721,237.40/995,220.42 = 398,903.48/x
  3. Step 3: Cross multiply
    721,237.40x = 995,220.42 × 398,903.48
  4. Step 4: Simplify right side
    721,237.40x = 396,996,888,905.06
  5. Step 5: Solve for x
    x = 396,996,888,905.06/721,237.40
  6. Step 6: Final answer
    x = 550,438.58

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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.