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Finding the Fourth Proportional to 718,245.14, 991,185 and 395,966.81

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Solution

The fourth proportional to 718,245.14, 991,185 and 395,966.81 is: 546,437.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,245.14 : 991,185 = 395,966.81 : x
  2. Step 2: Convert to fraction form
    718,245.14/991,185 = 395,966.81/x
  3. Step 3: Cross multiply
    718,245.14x = 991,185 × 395,966.81
  4. Step 4: Simplify right side
    718,245.14x = 392,476,362,569.85
  5. Step 5: Solve for x
    x = 392,476,362,569.85/718,245.14
  6. Step 6: Final answer
    x = 546,437.90

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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.