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Finding the Fourth Proportional to 660.20, 989.96 and 294.80

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Solution

The fourth proportional to 660.20, 989.96 and 294.80 is: 442.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.20 : 989.96 = 294.80 : x
  2. Step 2: Convert to fraction form
    660.20/989.96 = 294.80/x
  3. Step 3: Cross multiply
    660.20x = 989.96 × 294.80
  4. Step 4: Simplify right side
    660.20x = 291,840.21
  5. Step 5: Solve for x
    x = 291,840.21/660.20
  6. Step 6: Final answer
    x = 442.05

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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.