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Finding the Fourth Proportional to 978.32, 1,467.08 and 361.80

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Solution

The fourth proportional to 978.32, 1,467.08 and 361.80 is: 542.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.32 : 1,467.08 = 361.80 : x
  2. Step 2: Convert to fraction form
    978.32/1,467.08 = 361.80/x
  3. Step 3: Cross multiply
    978.32x = 1,467.08 × 361.80
  4. Step 4: Simplify right side
    978.32x = 530,789.54
  5. Step 5: Solve for x
    x = 530,789.54/978.32
  6. Step 6: Final answer
    x = 542.55

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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.