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Finding the Fourth Proportional to 660.20, 989.62 and 313.62

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Solution

The fourth proportional to 660.20, 989.62 and 313.62 is: 470.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.20 : 989.62 = 313.62 : x
  2. Step 2: Convert to fraction form
    660.20/989.62 = 313.62/x
  3. Step 3: Cross multiply
    660.20x = 989.62 × 313.62
  4. Step 4: Simplify right side
    660.20x = 310,365.70
  5. Step 5: Solve for x
    x = 310,365.70/660.20
  6. Step 6: Final answer
    x = 470.11

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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.