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Finding the Fourth Proportional to 978.31, 1,468.43 and 665

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Solution

The fourth proportional to 978.31, 1,468.43 and 665 is: 998.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.31 : 1,468.43 = 665 : x
  2. Step 2: Convert to fraction form
    978.31/1,468.43 = 665/x
  3. Step 3: Cross multiply
    978.31x = 1,468.43 × 665
  4. Step 4: Simplify right side
    978.31x = 976,505.95
  5. Step 5: Solve for x
    x = 976,505.95/978.31
  6. Step 6: Final answer
    x = 998.16

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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.