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Finding the Fourth Proportional to 978.21, 1,348.45 and 682.97

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Solution

The fourth proportional to 978.21, 1,348.45 and 682.97 is: 941.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.21 : 1,348.45 = 682.97 : x
  2. Step 2: Convert to fraction form
    978.21/1,348.45 = 682.97/x
  3. Step 3: Cross multiply
    978.21x = 1,348.45 × 682.97
  4. Step 4: Simplify right side
    978.21x = 920,942.45
  5. Step 5: Solve for x
    x = 920,942.45/978.21
  6. Step 6: Final answer
    x = 941.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.