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Finding the Fourth Proportional to 718,361.20, 991,345.28 and 396,083.08

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Solution

The fourth proportional to 718,361.20, 991,345.28 and 396,083.08 is: 546,598.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,361.20 : 991,345.28 = 396,083.08 : x
  2. Step 2: Convert to fraction form
    718,361.20/991,345.28 = 396,083.08/x
  3. Step 3: Cross multiply
    718,361.20x = 991,345.28 × 396,083.08
  4. Step 4: Simplify right side
    718,361.20x = 392,655,091,845.86
  5. Step 5: Solve for x
    x = 392,655,091,845.86/718,361.20
  6. Step 6: Final answer
    x = 546,598.41

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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.