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Finding the Fourth Proportional to 721,478.72, 995,641.80 and 399,202.40

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Solution

The fourth proportional to 721,478.72, 995,641.80 and 399,202.40 is: 550,899.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,478.72 : 995,641.80 = 399,202.40 : x
  2. Step 2: Convert to fraction form
    721,478.72/995,641.80 = 399,202.40/x
  3. Step 3: Cross multiply
    721,478.72x = 995,641.80 × 399,202.40
  4. Step 4: Simplify right side
    721,478.72x = 397,462,596,100.32
  5. Step 5: Solve for x
    x = 397,462,596,100.32/721,478.72
  6. Step 6: Final answer
    x = 550,899.96

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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.