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Finding the Fourth Proportional to 1,243.84, 1,868.48 and 1,068.88

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Solution

The fourth proportional to 1,243.84, 1,868.48 and 1,068.88 is: 1,605.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.84 : 1,868.48 = 1,068.88 : x
  2. Step 2: Convert to fraction form
    1,243.84/1,868.48 = 1,068.88/x
  3. Step 3: Cross multiply
    1,243.84x = 1,868.48 × 1,068.88
  4. Step 4: Simplify right side
    1,243.84x = 1,997,180.90
  5. Step 5: Solve for x
    x = 1,997,180.90/1,243.84
  6. Step 6: Final answer
    x = 1,605.66

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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.