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Finding the Fourth Proportional to 812,866.60, 1,217,987.70 and 512,810.20

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Solution

The fourth proportional to 812,866.60, 1,217,987.70 and 512,810.20 is: 768,387.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,866.60 : 1,217,987.70 = 512,810.20 : x
  2. Step 2: Convert to fraction form
    812,866.60/1,217,987.70 = 512,810.20/x
  3. Step 3: Cross multiply
    812,866.60x = 1,217,987.70 × 512,810.20
  4. Step 4: Simplify right side
    812,866.60x = 624,596,516,034.54
  5. Step 5: Solve for x
    x = 624,596,516,034.54/812,866.60
  6. Step 6: Final answer
    x = 768,387.48

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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.