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Finding the Fourth Proportional to 102.10, 140.90 and 55.47

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Solution

The fourth proportional to 102.10, 140.90 and 55.47 is: 76.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.10 : 140.90 = 55.47 : x
  2. Step 2: Convert to fraction form
    102.10/140.90 = 55.47/x
  3. Step 3: Cross multiply
    102.10x = 140.90 × 55.47
  4. Step 4: Simplify right side
    102.10x = 7,815.45
  5. Step 5: Solve for x
    x = 7,815.45/102.10
  6. Step 6: Final answer
    x = 76.55

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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.