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Finding the Fourth Proportional to 876.81, 1,208.21 and 718.96

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Solution

The fourth proportional to 876.81, 1,208.21 and 718.96 is: 990.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.81 : 1,208.21 = 718.96 : x
  2. Step 2: Convert to fraction form
    876.81/1,208.21 = 718.96/x
  3. Step 3: Cross multiply
    876.81x = 1,208.21 × 718.96
  4. Step 4: Simplify right side
    876.81x = 868,654.66
  5. Step 5: Solve for x
    x = 868,654.66/876.81
  6. Step 6: Final answer
    x = 990.70

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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.