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Finding the Fourth Proportional to 75.02, 103.46 and 55.31

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Solution

The fourth proportional to 75.02, 103.46 and 55.31 is: 76.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.02 : 103.46 = 55.31 : x
  2. Step 2: Convert to fraction form
    75.02/103.46 = 55.31/x
  3. Step 3: Cross multiply
    75.02x = 103.46 × 55.31
  4. Step 4: Simplify right side
    75.02x = 5,721.58
  5. Step 5: Solve for x
    x = 5,721.58/75.02
  6. Step 6: Final answer
    x = 76.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.