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Finding the Fourth Proportional to 908.65, 1,359.60 and 665.65

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Solution

The fourth proportional to 908.65, 1,359.60 and 665.65 is: 996.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.65 : 1,359.60 = 665.65 : x
  2. Step 2: Convert to fraction form
    908.65/1,359.60 = 665.65/x
  3. Step 3: Cross multiply
    908.65x = 1,359.60 × 665.65
  4. Step 4: Simplify right side
    908.65x = 905,017.74
  5. Step 5: Solve for x
    x = 905,017.74/908.65
  6. Step 6: Final answer
    x = 996.00

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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.