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Finding the Fourth Proportional to 1,881.71, 2,821.20 and 711.62

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Solution

The fourth proportional to 1,881.71, 2,821.20 and 711.62 is: 1,066.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,881.71 : 2,821.20 = 711.62 : x
  2. Step 2: Convert to fraction form
    1,881.71/2,821.20 = 711.62/x
  3. Step 3: Cross multiply
    1,881.71x = 2,821.20 × 711.62
  4. Step 4: Simplify right side
    1,881.71x = 2,007,622.34
  5. Step 5: Solve for x
    x = 2,007,622.34/1,881.71
  6. Step 6: Final answer
    x = 1,066.91

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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.