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Finding the Fourth Proportional to 74.50, 102.78 and 45.38

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Solution

The fourth proportional to 74.50, 102.78 and 45.38 is: 62.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.50 : 102.78 = 45.38 : x
  2. Step 2: Convert to fraction form
    74.50/102.78 = 45.38/x
  3. Step 3: Cross multiply
    74.50x = 102.78 × 45.38
  4. Step 4: Simplify right side
    74.50x = 4,664.16
  5. Step 5: Solve for x
    x = 4,664.16/74.50
  6. Step 6: Final answer
    x = 62.61

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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.