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Finding the Fourth Proportional to 761.83, 1,142.74 and 274.88

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Solution

The fourth proportional to 761.83, 1,142.74 and 274.88 is: 412.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.83 : 1,142.74 = 274.88 : x
  2. Step 2: Convert to fraction form
    761.83/1,142.74 = 274.88/x
  3. Step 3: Cross multiply
    761.83x = 1,142.74 × 274.88
  4. Step 4: Simplify right side
    761.83x = 314,109.97
  5. Step 5: Solve for x
    x = 314,109.97/761.83
  6. Step 6: Final answer
    x = 412.31

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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.