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Finding the Fourth Proportional to 2,171.50, 2,996.70 and 1,240

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Solution

The fourth proportional to 2,171.50, 2,996.70 and 1,240 is: 1,711.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.50 : 2,996.70 = 1,240 : x
  2. Step 2: Convert to fraction form
    2,171.50/2,996.70 = 1,240/x
  3. Step 3: Cross multiply
    2,171.50x = 2,996.70 × 1,240
  4. Step 4: Simplify right side
    2,171.50x = 3,715,908
  5. Step 5: Solve for x
    x = 3,715,908/2,171.50
  6. Step 6: Final answer
    x = 1,711.22

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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.