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Finding the Fourth Proportional to 761.39, 1,142.55 and 274.40

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Solution

The fourth proportional to 761.39, 1,142.55 and 274.40 is: 411.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.39 : 1,142.55 = 274.40 : x
  2. Step 2: Convert to fraction form
    761.39/1,142.55 = 274.40/x
  3. Step 3: Cross multiply
    761.39x = 1,142.55 × 274.40
  4. Step 4: Simplify right side
    761.39x = 313,515.72
  5. Step 5: Solve for x
    x = 313,515.72/761.39
  6. Step 6: Final answer
    x = 411.77

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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.