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Finding the Fourth Proportional to 74.55, 102.78 and 49.93

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Solution

The fourth proportional to 74.55, 102.78 and 49.93 is: 68.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.55 : 102.78 = 49.93 : x
  2. Step 2: Convert to fraction form
    74.55/102.78 = 49.93/x
  3. Step 3: Cross multiply
    74.55x = 102.78 × 49.93
  4. Step 4: Simplify right side
    74.55x = 5,131.81
  5. Step 5: Solve for x
    x = 5,131.81/74.55
  6. Step 6: Final answer
    x = 68.84

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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.