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Finding the Fourth Proportional to 755.45, 1,132.78 and 292.72

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Solution

The fourth proportional to 755.45, 1,132.78 and 292.72 is: 438.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.45 : 1,132.78 = 292.72 : x
  2. Step 2: Convert to fraction form
    755.45/1,132.78 = 292.72/x
  3. Step 3: Cross multiply
    755.45x = 1,132.78 × 292.72
  4. Step 4: Simplify right side
    755.45x = 331,587.36
  5. Step 5: Solve for x
    x = 331,587.36/755.45
  6. Step 6: Final answer
    x = 438.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.