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Finding the Fourth Proportional to 1,218.66, 1,681.75 and 694.70

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Solution

The fourth proportional to 1,218.66, 1,681.75 and 694.70 is: 958.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.66 : 1,681.75 = 694.70 : x
  2. Step 2: Convert to fraction form
    1,218.66/1,681.75 = 694.70/x
  3. Step 3: Cross multiply
    1,218.66x = 1,681.75 × 694.70
  4. Step 4: Simplify right side
    1,218.66x = 1,168,301.58
  5. Step 5: Solve for x
    x = 1,168,301.58/1,218.66
  6. Step 6: Final answer
    x = 958.68

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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.