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Finding the Fourth Proportional to 978.90, 1,468.55 and 330.09

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Solution

The fourth proportional to 978.90, 1,468.55 and 330.09 is: 495.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.90 : 1,468.55 = 330.09 : x
  2. Step 2: Convert to fraction form
    978.90/1,468.55 = 330.09/x
  3. Step 3: Cross multiply
    978.90x = 1,468.55 × 330.09
  4. Step 4: Simplify right side
    978.90x = 484,753.67
  5. Step 5: Solve for x
    x = 484,753.67/978.90
  6. Step 6: Final answer
    x = 495.20

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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.