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Finding the Fourth Proportional to 660.10, 988.80 and 335.65

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Solution

The fourth proportional to 660.10, 988.80 and 335.65 is: 502.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.10 : 988.80 = 335.65 : x
  2. Step 2: Convert to fraction form
    660.10/988.80 = 335.65/x
  3. Step 3: Cross multiply
    660.10x = 988.80 × 335.65
  4. Step 4: Simplify right side
    660.10x = 331,890.72
  5. Step 5: Solve for x
    x = 331,890.72/660.10
  6. Step 6: Final answer
    x = 502.79

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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.