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Finding the Fourth Proportional to 45.90, 62.78 and 45.18

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Solution

The fourth proportional to 45.90, 62.78 and 45.18 is: 61.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.90 : 62.78 = 45.18 : x
  2. Step 2: Convert to fraction form
    45.90/62.78 = 45.18/x
  3. Step 3: Cross multiply
    45.90x = 62.78 × 45.18
  4. Step 4: Simplify right side
    45.90x = 2,836.17
  5. Step 5: Solve for x
    x = 2,836.17/45.90
  6. Step 6: Final answer
    x = 61.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.