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Finding the Fourth Proportional to 978.47, 1,466.79 and 490.95

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Solution

The fourth proportional to 978.47, 1,466.79 and 490.95 is: 735.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.47 : 1,466.79 = 490.95 : x
  2. Step 2: Convert to fraction form
    978.47/1,466.79 = 490.95/x
  3. Step 3: Cross multiply
    978.47x = 1,466.79 × 490.95
  4. Step 4: Simplify right side
    978.47x = 720,124.22
  5. Step 5: Solve for x
    x = 720,124.22/978.47
  6. Step 6: Final answer
    x = 735.97

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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.