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Finding the Fourth Proportional to 978.65, 1,468.25 and 329.39

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Solution

The fourth proportional to 978.65, 1,468.25 and 329.39 is: 494.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.65 : 1,468.25 = 329.39 : x
  2. Step 2: Convert to fraction form
    978.65/1,468.25 = 329.39/x
  3. Step 3: Cross multiply
    978.65x = 1,468.25 × 329.39
  4. Step 4: Simplify right side
    978.65x = 483,630.13
  5. Step 5: Solve for x
    x = 483,630.13/978.65
  6. Step 6: Final answer
    x = 494.18

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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.