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Finding the Fourth Proportional to 721,608.32, 995,804.58 and 399,318.20

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Solution

The fourth proportional to 721,608.32, 995,804.58 and 399,318.20 is: 551,050.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,608.32 : 995,804.58 = 399,318.20 : x
  2. Step 2: Convert to fraction form
    721,608.32/995,804.58 = 399,318.20/x
  3. Step 3: Cross multiply
    721,608.32x = 995,804.58 × 399,318.20
  4. Step 4: Simplify right side
    721,608.32x = 397,642,892,437.36
  5. Step 5: Solve for x
    x = 397,642,892,437.36/721,608.32
  6. Step 6: Final answer
    x = 551,050.87

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Double scale
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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.