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Finding the Fourth Proportional to 1,217.08, 1,679.81 and 774.89

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Solution

The fourth proportional to 1,217.08, 1,679.81 and 774.89 is: 1,069.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.08 : 1,679.81 = 774.89 : x
  2. Step 2: Convert to fraction form
    1,217.08/1,679.81 = 774.89/x
  3. Step 3: Cross multiply
    1,217.08x = 1,679.81 × 774.89
  4. Step 4: Simplify right side
    1,217.08x = 1,301,673.26
  5. Step 5: Solve for x
    x = 1,301,673.26/1,217.08
  6. Step 6: Final answer
    x = 1,069.51

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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.