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Finding the Fourth Proportional to 1,281,728.53, 1,923,748.40 and 683,188.21

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Solution

The fourth proportional to 1,281,728.53, 1,923,748.40 and 683,188.21 is: 1,025,398.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281,728.53 : 1,923,748.40 = 683,188.21 : x
  2. Step 2: Convert to fraction form
    1,281,728.53/1,923,748.40 = 683,188.21/x
  3. Step 3: Cross multiply
    1,281,728.53x = 1,923,748.40 × 683,188.21
  4. Step 4: Simplify right side
    1,281,728.53x = 1,314,282,225,886.36
  5. Step 5: Solve for x
    x = 1,314,282,225,886.36/1,281,728.53
  6. Step 6: Final answer
    x = 1,025,398.28

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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.