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Finding the Fourth Proportional to 761.63, 1,142.44 and 419.63

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Solution

The fourth proportional to 761.63, 1,142.44 and 419.63 is: 629.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.63 : 1,142.44 = 419.63 : x
  2. Step 2: Convert to fraction form
    761.63/1,142.44 = 419.63/x
  3. Step 3: Cross multiply
    761.63x = 1,142.44 × 419.63
  4. Step 4: Simplify right side
    761.63x = 479,395.34
  5. Step 5: Solve for x
    x = 479,395.34/761.63
  6. Step 6: Final answer
    x = 629.44

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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.