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Finding the Fourth Proportional to 942.15, 1,411.20 and 759.90

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Solution

The fourth proportional to 942.15, 1,411.20 and 759.90 is: 1,138.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.15 : 1,411.20 = 759.90 : x
  2. Step 2: Convert to fraction form
    942.15/1,411.20 = 759.90/x
  3. Step 3: Cross multiply
    942.15x = 1,411.20 × 759.90
  4. Step 4: Simplify right side
    942.15x = 1,072,370.88
  5. Step 5: Solve for x
    x = 1,072,370.88/942.15
  6. Step 6: Final answer
    x = 1,138.22

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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.