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Finding the Fourth Proportional to 638,186.40, 956,113.20 and 388,576.80

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Solution

The fourth proportional to 638,186.40, 956,113.20 and 388,576.80 is: 582,155.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,186.40 : 956,113.20 = 388,576.80 : x
  2. Step 2: Convert to fraction form
    638,186.40/956,113.20 = 388,576.80/x
  3. Step 3: Cross multiply
    638,186.40x = 956,113.20 × 388,576.80
  4. Step 4: Simplify right side
    638,186.40x = 371,523,407,693.76
  5. Step 5: Solve for x
    x = 371,523,407,693.76/638,186.40
  6. Step 6: Final answer
    x = 582,155.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.