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Finding the Fourth Proportional to 1,381.72, 2,074.62 and 922.36

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Solution

The fourth proportional to 1,381.72, 2,074.62 and 922.36 is: 1,384.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.72 : 2,074.62 = 922.36 : x
  2. Step 2: Convert to fraction form
    1,381.72/2,074.62 = 922.36/x
  3. Step 3: Cross multiply
    1,381.72x = 2,074.62 × 922.36
  4. Step 4: Simplify right side
    1,381.72x = 1,913,546.50
  5. Step 5: Solve for x
    x = 1,913,546.50/1,381.72
  6. Step 6: Final answer
    x = 1,384.90

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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.