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Finding the Fourth Proportional to 942.74, 1,411.67 and 756.78

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Solution

The fourth proportional to 942.74, 1,411.67 and 756.78 is: 1,133.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.74 : 1,411.67 = 756.78 : x
  2. Step 2: Convert to fraction form
    942.74/1,411.67 = 756.78/x
  3. Step 3: Cross multiply
    942.74x = 1,411.67 × 756.78
  4. Step 4: Simplify right side
    942.74x = 1,068,319.84
  5. Step 5: Solve for x
    x = 1,068,319.84/942.74
  6. Step 6: Final answer
    x = 1,133.21

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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.