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Finding the Fourth Proportional to 927.08, 1,390.62 and 378.88

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Solution

The fourth proportional to 927.08, 1,390.62 and 378.88 is: 568.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.08 : 1,390.62 = 378.88 : x
  2. Step 2: Convert to fraction form
    927.08/1,390.62 = 378.88/x
  3. Step 3: Cross multiply
    927.08x = 1,390.62 × 378.88
  4. Step 4: Simplify right side
    927.08x = 526,876.05
  5. Step 5: Solve for x
    x = 526,876.05/927.08
  6. Step 6: Final answer
    x = 568.32

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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.