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Finding the Fourth Proportional to 908.76, 1,363.92 and 665.76

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Solution

The fourth proportional to 908.76, 1,363.92 and 665.76 is: 999.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.76 : 1,363.92 = 665.76 : x
  2. Step 2: Convert to fraction form
    908.76/1,363.92 = 665.76/x
  3. Step 3: Cross multiply
    908.76x = 1,363.92 × 665.76
  4. Step 4: Simplify right side
    908.76x = 908,043.38
  5. Step 5: Solve for x
    x = 908,043.38/908.76
  6. Step 6: Final answer
    x = 999.21

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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.