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Finding the Fourth Proportional to 1,287,687.62, 1,777,010.04 and 771,741.20

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Solution

The fourth proportional to 1,287,687.62, 1,777,010.04 and 771,741.20 is: 1,065,003.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,687.62 : 1,777,010.04 = 771,741.20 : x
  2. Step 2: Convert to fraction form
    1,287,687.62/1,777,010.04 = 771,741.20/x
  3. Step 3: Cross multiply
    1,287,687.62x = 1,777,010.04 × 771,741.20
  4. Step 4: Simplify right side
    1,287,687.62x = 1,371,391,851,796.60
  5. Step 5: Solve for x
    x = 1,371,391,851,796.60/1,287,687.62
  6. Step 6: Final answer
    x = 1,065,003.53

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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.