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Finding the Fourth Proportional to 866.51, 1,293.36 and 757.70

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Solution

The fourth proportional to 866.51, 1,293.36 and 757.70 is: 1,130.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.51 : 1,293.36 = 757.70 : x
  2. Step 2: Convert to fraction form
    866.51/1,293.36 = 757.70/x
  3. Step 3: Cross multiply
    866.51x = 1,293.36 × 757.70
  4. Step 4: Simplify right side
    866.51x = 979,972.41
  5. Step 5: Solve for x
    x = 979,972.41/866.51
  6. Step 6: Final answer
    x = 1,130.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.