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Finding the Fourth Proportional to 1,290,939.53, 1,934,637.80 and 816,776.06

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Solution

The fourth proportional to 1,290,939.53, 1,934,637.80 and 816,776.06 is: 1,224,043.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,939.53 : 1,934,637.80 = 816,776.06 : x
  2. Step 2: Convert to fraction form
    1,290,939.53/1,934,637.80 = 816,776.06/x
  3. Step 3: Cross multiply
    1,290,939.53x = 1,934,637.80 × 816,776.06
  4. Step 4: Simplify right side
    1,290,939.53x = 1,580,165,830,648.36
  5. Step 5: Solve for x
    x = 1,580,165,830,648.36/1,290,939.53
  6. Step 6: Final answer
    x = 1,224,043.26

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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.