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Finding the Fourth Proportional to 1,216, 1,677.81 and 718.66

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Solution

The fourth proportional to 1,216, 1,677.81 and 718.66 is: 991.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216 : 1,677.81 = 718.66 : x
  2. Step 2: Convert to fraction form
    1,216/1,677.81 = 718.66/x
  3. Step 3: Cross multiply
    1,216x = 1,677.81 × 718.66
  4. Step 4: Simplify right side
    1,216x = 1,205,774.93
  5. Step 5: Solve for x
    x = 1,205,774.93/1,216
  6. Step 6: Final answer
    x = 991.59

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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.