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Finding the Fourth Proportional to 979.94, 1,351.94 and 560.31

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Solution

The fourth proportional to 979.94, 1,351.94 and 560.31 is: 773.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.94 : 1,351.94 = 560.31 : x
  2. Step 2: Convert to fraction form
    979.94/1,351.94 = 560.31/x
  3. Step 3: Cross multiply
    979.94x = 1,351.94 × 560.31
  4. Step 4: Simplify right side
    979.94x = 757,502.70
  5. Step 5: Solve for x
    x = 757,502.70/979.94
  6. Step 6: Final answer
    x = 773.01

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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.