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Finding the Fourth Proportional to 978.21, 1,349.42 and 604.89

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Solution

The fourth proportional to 978.21, 1,349.42 and 604.89 is: 834.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.21 : 1,349.42 = 604.89 : x
  2. Step 2: Convert to fraction form
    978.21/1,349.42 = 604.89/x
  3. Step 3: Cross multiply
    978.21x = 1,349.42 × 604.89
  4. Step 4: Simplify right side
    978.21x = 816,247.64
  5. Step 5: Solve for x
    x = 816,247.64/978.21
  6. Step 6: Final answer
    x = 834.43

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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.