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Finding the Fourth Proportional to 1,266.80, 1,898.61 and 680.34

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Solution

The fourth proportional to 1,266.80, 1,898.61 and 680.34 is: 1,019.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.80 : 1,898.61 = 680.34 : x
  2. Step 2: Convert to fraction form
    1,266.80/1,898.61 = 680.34/x
  3. Step 3: Cross multiply
    1,266.80x = 1,898.61 × 680.34
  4. Step 4: Simplify right side
    1,266.80x = 1,291,700.33
  5. Step 5: Solve for x
    x = 1,291,700.33/1,266.80
  6. Step 6: Final answer
    x = 1,019.66

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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.