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Finding the Fourth Proportional to 927.36, 1,390.08 and 440

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Solution

The fourth proportional to 927.36, 1,390.08 and 440 is: 659.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.36 : 1,390.08 = 440 : x
  2. Step 2: Convert to fraction form
    927.36/1,390.08 = 440/x
  3. Step 3: Cross multiply
    927.36x = 1,390.08 × 440
  4. Step 4: Simplify right side
    927.36x = 611,635.20
  5. Step 5: Solve for x
    x = 611,635.20/927.36
  6. Step 6: Final answer
    x = 659.54

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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.