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Finding the Fourth Proportional to 981.10, 1,353.42 and 665.98

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Solution

The fourth proportional to 981.10, 1,353.42 and 665.98 is: 918.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.10 : 1,353.42 = 665.98 : x
  2. Step 2: Convert to fraction form
    981.10/1,353.42 = 665.98/x
  3. Step 3: Cross multiply
    981.10x = 1,353.42 × 665.98
  4. Step 4: Simplify right side
    981.10x = 901,350.65
  5. Step 5: Solve for x
    x = 901,350.65/981.10
  6. Step 6: Final answer
    x = 918.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.