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Finding the Fourth Proportional to 761.48, 1,142.39 and 299.30

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Solution

The fourth proportional to 761.48, 1,142.39 and 299.30 is: 449.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.48 : 1,142.39 = 299.30 : x
  2. Step 2: Convert to fraction form
    761.48/1,142.39 = 299.30/x
  3. Step 3: Cross multiply
    761.48x = 1,142.39 × 299.30
  4. Step 4: Simplify right side
    761.48x = 341,918.69
  5. Step 5: Solve for x
    x = 341,918.69/761.48
  6. Step 6: Final answer
    x = 449.02

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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.