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Finding the Fourth Proportional to 55.04, 75.90 and 34.31

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Solution

The fourth proportional to 55.04, 75.90 and 34.31 is: 47.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.04 : 75.90 = 34.31 : x
  2. Step 2: Convert to fraction form
    55.04/75.90 = 34.31/x
  3. Step 3: Cross multiply
    55.04x = 75.90 × 34.31
  4. Step 4: Simplify right side
    55.04x = 2,604.44
  5. Step 5: Solve for x
    x = 2,604.44/55.04
  6. Step 6: Final answer
    x = 47.32

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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.