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Finding the Fourth Proportional to 1,791,987.78, 2,472,942.04 and 987,171.78

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Solution

The fourth proportional to 1,791,987.78, 2,472,942.04 and 987,171.78 is: 1,362,296.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791,987.78 : 2,472,942.04 = 987,171.78 : x
  2. Step 2: Convert to fraction form
    1,791,987.78/2,472,942.04 = 987,171.78/x
  3. Step 3: Cross multiply
    1,791,987.78x = 2,472,942.04 × 987,171.78
  4. Step 4: Simplify right side
    1,791,987.78x = 2,441,218,595,463.63
  5. Step 5: Solve for x
    x = 2,441,218,595,463.63/1,791,987.78
  6. Step 6: Final answer
    x = 1,362,296.45

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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.