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Finding the Fourth Proportional to 718,451.91, 991,457.59 and 396,175.59

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Solution

The fourth proportional to 718,451.91, 991,457.59 and 396,175.59 is: 546,718.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,451.91 : 991,457.59 = 396,175.59 : x
  2. Step 2: Convert to fraction form
    718,451.91/991,457.59 = 396,175.59/x
  3. Step 3: Cross multiply
    718,451.91x = 991,457.59 × 396,175.59
  4. Step 4: Simplify right side
    718,451.91x = 392,791,298,156.87
  5. Step 5: Solve for x
    x = 392,791,298,156.87/718,451.91
  6. Step 6: Final answer
    x = 546,718.98

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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.