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Finding the Fourth Proportional to 1,391,984.46, 1,920,847.50 and 818,913.78

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Solution

The fourth proportional to 1,391,984.46, 1,920,847.50 and 818,913.78 is: 1,130,047.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,984.46 : 1,920,847.50 = 818,913.78 : x
  2. Step 2: Convert to fraction form
    1,391,984.46/1,920,847.50 = 818,913.78/x
  3. Step 3: Cross multiply
    1,391,984.46x = 1,920,847.50 × 818,913.78
  4. Step 4: Simplify right side
    1,391,984.46x = 1,573,008,487,028.55
  5. Step 5: Solve for x
    x = 1,573,008,487,028.55/1,391,984.46
  6. Step 6: Final answer
    x = 1,130,047.45

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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.