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Finding the Fourth Proportional to 762.79, 1,144.21 and 242.78

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Solution

The fourth proportional to 762.79, 1,144.21 and 242.78 is: 364.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.79 : 1,144.21 = 242.78 : x
  2. Step 2: Convert to fraction form
    762.79/1,144.21 = 242.78/x
  3. Step 3: Cross multiply
    762.79x = 1,144.21 × 242.78
  4. Step 4: Simplify right side
    762.79x = 277,785.58
  5. Step 5: Solve for x
    x = 277,785.58/762.79
  6. Step 6: Final answer
    x = 364.17

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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.