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Finding the Fourth Proportional to 1,218.79, 1,682.31 and 695.17

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Solution

The fourth proportional to 1,218.79, 1,682.31 and 695.17 is: 959.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.79 : 1,682.31 = 695.17 : x
  2. Step 2: Convert to fraction form
    1,218.79/1,682.31 = 695.17/x
  3. Step 3: Cross multiply
    1,218.79x = 1,682.31 × 695.17
  4. Step 4: Simplify right side
    1,218.79x = 1,169,491.44
  5. Step 5: Solve for x
    x = 1,169,491.44/1,218.79
  6. Step 6: Final answer
    x = 959.55

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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.