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Finding the Fourth Proportional to 927.48, 1,390.26 and 639

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Solution

The fourth proportional to 927.48, 1,390.26 and 639 is: 957.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.48 : 1,390.26 = 639 : x
  2. Step 2: Convert to fraction form
    927.48/1,390.26 = 639/x
  3. Step 3: Cross multiply
    927.48x = 1,390.26 × 639
  4. Step 4: Simplify right side
    927.48x = 888,376.14
  5. Step 5: Solve for x
    x = 888,376.14/927.48
  6. Step 6: Final answer
    x = 957.84

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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.