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Finding the Fourth Proportional to 1,306.68, 1,958.95 and 613.01

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Solution

The fourth proportional to 1,306.68, 1,958.95 and 613.01 is: 919.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.68 : 1,958.95 = 613.01 : x
  2. Step 2: Convert to fraction form
    1,306.68/1,958.95 = 613.01/x
  3. Step 3: Cross multiply
    1,306.68x = 1,958.95 × 613.01
  4. Step 4: Simplify right side
    1,306.68x = 1,200,855.94
  5. Step 5: Solve for x
    x = 1,200,855.94/1,306.68
  6. Step 6: Final answer
    x = 919.01

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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.