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Finding the Fourth Proportional to 927.84, 1,392.18 and 311.64

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Solution

The fourth proportional to 927.84, 1,392.18 and 311.64 is: 467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.84 : 1,392.18 = 311.64 : x
  2. Step 2: Convert to fraction form
    927.84/1,392.18 = 311.64/x
  3. Step 3: Cross multiply
    927.84x = 1,392.18 × 311.64
  4. Step 4: Simplify right side
    927.84x = 433,858.98
  5. Step 5: Solve for x
    x = 433,858.98/927.84
  6. Step 6: Final answer
    x = 467.60

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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.