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Finding the Fourth Proportional to 62.18, 85.78 and 45.80

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Solution

The fourth proportional to 62.18, 85.78 and 45.80 is: 63.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.18 : 85.78 = 45.80 : x
  2. Step 2: Convert to fraction form
    62.18/85.78 = 45.80/x
  3. Step 3: Cross multiply
    62.18x = 85.78 × 45.80
  4. Step 4: Simplify right side
    62.18x = 3,928.72
  5. Step 5: Solve for x
    x = 3,928.72/62.18
  6. Step 6: Final answer
    x = 63.18

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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.