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Finding the Fourth Proportional to 3,171.78, 4,757.67 and 1,440

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Solution

The fourth proportional to 3,171.78, 4,757.67 and 1,440 is: 2,160

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,171.78 : 4,757.67 = 1,440 : x
  2. Step 2: Convert to fraction form
    3,171.78/4,757.67 = 1,440/x
  3. Step 3: Cross multiply
    3,171.78x = 4,757.67 × 1,440
  4. Step 4: Simplify right side
    3,171.78x = 6,851,044.80
  5. Step 5: Solve for x
    x = 6,851,044.80/3,171.78
  6. Step 6: Final answer
    x = 2,160

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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.