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Finding the Fourth Proportional to 927.02, 1,390.89 and 440.48

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Solution

The fourth proportional to 927.02, 1,390.89 and 440.48 is: 660.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.02 : 1,390.89 = 440.48 : x
  2. Step 2: Convert to fraction form
    927.02/1,390.89 = 440.48/x
  3. Step 3: Cross multiply
    927.02x = 1,390.89 × 440.48
  4. Step 4: Simplify right side
    927.02x = 612,659.23
  5. Step 5: Solve for x
    x = 612,659.23/927.02
  6. Step 6: Final answer
    x = 660.89

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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.