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Finding the Fourth Proportional to 927.27, 1,390.91 and 278.46

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Solution

The fourth proportional to 927.27, 1,390.91 and 278.46 is: 417.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.27 : 1,390.91 = 278.46 : x
  2. Step 2: Convert to fraction form
    927.27/1,390.91 = 278.46/x
  3. Step 3: Cross multiply
    927.27x = 1,390.91 × 278.46
  4. Step 4: Simplify right side
    927.27x = 387,311.41
  5. Step 5: Solve for x
    x = 387,311.41/927.27
  6. Step 6: Final answer
    x = 417.69

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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.