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Finding the Fourth Proportional to 927.72, 1,390.20 and 904.79

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Solution

The fourth proportional to 927.72, 1,390.20 and 904.79 is: 1,355.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.72 : 1,390.20 = 904.79 : x
  2. Step 2: Convert to fraction form
    927.72/1,390.20 = 904.79/x
  3. Step 3: Cross multiply
    927.72x = 1,390.20 × 904.79
  4. Step 4: Simplify right side
    927.72x = 1,257,831.32
  5. Step 5: Solve for x
    x = 1,257,831.32/927.72
  6. Step 6: Final answer
    x = 1,355.83

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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.