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Finding the Fourth Proportional to 1,214.80, 1,676.52 and 691

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Solution

The fourth proportional to 1,214.80, 1,676.52 and 691 is: 953.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.80 : 1,676.52 = 691 : x
  2. Step 2: Convert to fraction form
    1,214.80/1,676.52 = 691/x
  3. Step 3: Cross multiply
    1,214.80x = 1,676.52 × 691
  4. Step 4: Simplify right side
    1,214.80x = 1,158,475.32
  5. Step 5: Solve for x
    x = 1,158,475.32/1,214.80
  6. Step 6: Final answer
    x = 953.63

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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.