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Finding the Fourth Proportional to 1,217.81, 1,679.85 and 775.35

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Solution

The fourth proportional to 1,217.81, 1,679.85 and 775.35 is: 1,069.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.81 : 1,679.85 = 775.35 : x
  2. Step 2: Convert to fraction form
    1,217.81/1,679.85 = 775.35/x
  3. Step 3: Cross multiply
    1,217.81x = 1,679.85 × 775.35
  4. Step 4: Simplify right side
    1,217.81x = 1,302,471.70
  5. Step 5: Solve for x
    x = 1,302,471.70/1,217.81
  6. Step 6: Final answer
    x = 1,069.52

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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.