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Finding the Fourth Proportional to 1,218.17, 1,681.18 and 694.37

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Solution

The fourth proportional to 1,218.17, 1,681.18 and 694.37 is: 958.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.17 : 1,681.18 = 694.37 : x
  2. Step 2: Convert to fraction form
    1,218.17/1,681.18 = 694.37/x
  3. Step 3: Cross multiply
    1,218.17x = 1,681.18 × 694.37
  4. Step 4: Simplify right side
    1,218.17x = 1,167,350.81
  5. Step 5: Solve for x
    x = 1,167,350.81/1,218.17
  6. Step 6: Final answer
    x = 958.29

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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.