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Finding the Fourth Proportional to 1,988,327.31, 2,743,793.89 and 1,128,774.75

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Solution

The fourth proportional to 1,988,327.31, 2,743,793.89 and 1,128,774.75 is: 1,557,653.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988,327.31 : 2,743,793.89 = 1,128,774.75 : x
  2. Step 2: Convert to fraction form
    1,988,327.31/2,743,793.89 = 1,128,774.75/x
  3. Step 3: Cross multiply
    1,988,327.31x = 2,743,793.89 × 1,128,774.75
  4. Step 4: Simplify right side
    1,988,327.31x = 3,097,125,262,236.28
  5. Step 5: Solve for x
    x = 3,097,125,262,236.28/1,988,327.31
  6. Step 6: Final answer
    x = 1,557,653.64

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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.