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Finding the Fourth Proportional to 978.61, 1,467.94 and 285.35

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Solution

The fourth proportional to 978.61, 1,467.94 and 285.35 is: 428.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.61 : 1,467.94 = 285.35 : x
  2. Step 2: Convert to fraction form
    978.61/1,467.94 = 285.35/x
  3. Step 3: Cross multiply
    978.61x = 1,467.94 × 285.35
  4. Step 4: Simplify right side
    978.61x = 418,876.68
  5. Step 5: Solve for x
    x = 418,876.68/978.61
  6. Step 6: Final answer
    x = 428.03

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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.