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Finding the Fourth Proportional to 927.20, 1,390.08 and 310.52

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Solution

The fourth proportional to 927.20, 1,390.08 and 310.52 is: 465.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.20 : 1,390.08 = 310.52 : x
  2. Step 2: Convert to fraction form
    927.20/1,390.08 = 310.52/x
  3. Step 3: Cross multiply
    927.20x = 1,390.08 × 310.52
  4. Step 4: Simplify right side
    927.20x = 431,647.64
  5. Step 5: Solve for x
    x = 431,647.64/927.20
  6. Step 6: Final answer
    x = 465.54

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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.