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Finding the Fourth Proportional to 1,304.80, 1,955.34 and 979.78

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Solution

The fourth proportional to 1,304.80, 1,955.34 and 979.78 is: 1,468.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,304.80 : 1,955.34 = 979.78 : x
  2. Step 2: Convert to fraction form
    1,304.80/1,955.34 = 979.78/x
  3. Step 3: Cross multiply
    1,304.80x = 1,955.34 × 979.78
  4. Step 4: Simplify right side
    1,304.80x = 1,915,803.03
  5. Step 5: Solve for x
    x = 1,915,803.03/1,304.80
  6. Step 6: Final answer
    x = 1,468.27

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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.