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Finding the Fourth Proportional to 1,381.62, 2,072.43 and 947.46

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Solution

The fourth proportional to 1,381.62, 2,072.43 and 947.46 is: 1,421.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.62 : 2,072.43 = 947.46 : x
  2. Step 2: Convert to fraction form
    1,381.62/2,072.43 = 947.46/x
  3. Step 3: Cross multiply
    1,381.62x = 2,072.43 × 947.46
  4. Step 4: Simplify right side
    1,381.62x = 1,963,529.43
  5. Step 5: Solve for x
    x = 1,963,529.43/1,381.62
  6. Step 6: Final answer
    x = 1,421.18

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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.