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Finding the Fourth Proportional to 979.97, 1,462.94 and 945.78

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Solution

The fourth proportional to 979.97, 1,462.94 and 945.78 is: 1,411.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.97 : 1,462.94 = 945.78 : x
  2. Step 2: Convert to fraction form
    979.97/1,462.94 = 945.78/x
  3. Step 3: Cross multiply
    979.97x = 1,462.94 × 945.78
  4. Step 4: Simplify right side
    979.97x = 1,383,614.66
  5. Step 5: Solve for x
    x = 1,383,614.66/979.97
  6. Step 6: Final answer
    x = 1,411.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.