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Finding the Fourth Proportional to 1,306.98, 1,960.81 and 485.49

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Solution

The fourth proportional to 1,306.98, 1,960.81 and 485.49 is: 728.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.98 : 1,960.81 = 485.49 : x
  2. Step 2: Convert to fraction form
    1,306.98/1,960.81 = 485.49/x
  3. Step 3: Cross multiply
    1,306.98x = 1,960.81 × 485.49
  4. Step 4: Simplify right side
    1,306.98x = 951,953.65
  5. Step 5: Solve for x
    x = 951,953.65/1,306.98
  6. Step 6: Final answer
    x = 728.36

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1.5x scale

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.