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Finding the Fourth Proportional to 1,291,888.86, 1,936,530.62 and 812,459.28

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Solution

The fourth proportional to 1,291,888.86, 1,936,530.62 and 812,459.28 is: 1,217,869.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291,888.86 : 1,936,530.62 = 812,459.28 : x
  2. Step 2: Convert to fraction form
    1,291,888.86/1,936,530.62 = 812,459.28/x
  3. Step 3: Cross multiply
    1,291,888.86x = 1,936,530.62 × 812,459.28
  4. Step 4: Simplify right side
    1,291,888.86x = 1,573,352,273,223.15
  5. Step 5: Solve for x
    x = 1,573,352,273,223.15/1,291,888.86
  6. Step 6: Final answer
    x = 1,217,869.68

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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.