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Finding the Fourth Proportional to 642,540.66, 886,711.32 and 356,065.53

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Solution

The fourth proportional to 642,540.66, 886,711.32 and 356,065.53 is: 491,373.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,540.66 : 886,711.32 = 356,065.53 : x
  2. Step 2: Convert to fraction form
    642,540.66/886,711.32 = 356,065.53/x
  3. Step 3: Cross multiply
    642,540.66x = 886,711.32 × 356,065.53
  4. Step 4: Simplify right side
    642,540.66x = 315,727,336,112.80
  5. Step 5: Solve for x
    x = 315,727,336,112.80/642,540.66
  6. Step 6: Final answer
    x = 491,373.32

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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.