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Finding the Fourth Proportional to 921.19, 1,381.69 and 271.93

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Solution

The fourth proportional to 921.19, 1,381.69 and 271.93 is: 407.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.19 : 1,381.69 = 271.93 : x
  2. Step 2: Convert to fraction form
    921.19/1,381.69 = 271.93/x
  3. Step 3: Cross multiply
    921.19x = 1,381.69 × 271.93
  4. Step 4: Simplify right side
    921.19x = 375,722.96
  5. Step 5: Solve for x
    x = 375,722.96/921.19
  6. Step 6: Final answer
    x = 407.87

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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.