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Finding the Fourth Proportional to 761.95, 1,142.92 and 274.99

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Solution

The fourth proportional to 761.95, 1,142.92 and 274.99 is: 412.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.95 : 1,142.92 = 274.99 : x
  2. Step 2: Convert to fraction form
    761.95/1,142.92 = 274.99/x
  3. Step 3: Cross multiply
    761.95x = 1,142.92 × 274.99
  4. Step 4: Simplify right side
    761.95x = 314,285.86
  5. Step 5: Solve for x
    x = 314,285.86/761.95
  6. Step 6: Final answer
    x = 412.48

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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.