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Finding the Fourth Proportional to 713,788.59, 985,263.80 and 638,120.53

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Solution

The fourth proportional to 713,788.59, 985,263.80 and 638,120.53 is: 880,816.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,788.59 : 985,263.80 = 638,120.53 : x
  2. Step 2: Convert to fraction form
    713,788.59/985,263.80 = 638,120.53/x
  3. Step 3: Cross multiply
    713,788.59x = 985,263.80 × 638,120.53
  4. Step 4: Simplify right side
    713,788.59x = 628,717,052,592.05
  5. Step 5: Solve for x
    x = 628,717,052,592.05/713,788.59
  6. Step 6: Final answer
    x = 880,816.90

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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.