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Finding the Fourth Proportional to 754.90, 1,038.81 and 667.78

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Solution

The fourth proportional to 754.90, 1,038.81 and 667.78 is: 918.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.90 : 1,038.81 = 667.78 : x
  2. Step 2: Convert to fraction form
    754.90/1,038.81 = 667.78/x
  3. Step 3: Cross multiply
    754.90x = 1,038.81 × 667.78
  4. Step 4: Simplify right side
    754.90x = 693,696.54
  5. Step 5: Solve for x
    x = 693,696.54/754.90
  6. Step 6: Final answer
    x = 918.93

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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.