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Finding the Fourth Proportional to 721,339.36, 995,477.66 and 399,043.92

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Solution

The fourth proportional to 721,339.36, 995,477.66 and 399,043.92 is: 550,696.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,339.36 : 995,477.66 = 399,043.92 : x
  2. Step 2: Convert to fraction form
    721,339.36/995,477.66 = 399,043.92/x
  3. Step 3: Cross multiply
    721,339.36x = 995,477.66 × 399,043.92
  4. Step 4: Simplify right side
    721,339.36x = 397,239,307,718.83
  5. Step 5: Solve for x
    x = 397,239,307,718.83/721,339.36
  6. Step 6: Final answer
    x = 550,696.84

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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.