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Finding the Fourth Proportional to 978.61, 1,467.90 and 329.34

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Solution

The fourth proportional to 978.61, 1,467.90 and 329.34 is: 494.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.61 : 1,467.90 = 329.34 : x
  2. Step 2: Convert to fraction form
    978.61/1,467.90 = 329.34/x
  3. Step 3: Cross multiply
    978.61x = 1,467.90 × 329.34
  4. Step 4: Simplify right side
    978.61x = 483,438.19
  5. Step 5: Solve for x
    x = 483,438.19/978.61
  6. Step 6: Final answer
    x = 494.00

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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.