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Finding the Fourth Proportional to 761.44, 1,142.01 and 486.70

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Solution

The fourth proportional to 761.44, 1,142.01 and 486.70 is: 729.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.44 : 1,142.01 = 486.70 : x
  2. Step 2: Convert to fraction form
    761.44/1,142.01 = 486.70/x
  3. Step 3: Cross multiply
    761.44x = 1,142.01 × 486.70
  4. Step 4: Simplify right side
    761.44x = 555,816.27
  5. Step 5: Solve for x
    x = 555,816.27/761.44
  6. Step 6: Final answer
    x = 729.95

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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.