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Finding the Fourth Proportional to 74.45, 102.70 and 43.35

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Solution

The fourth proportional to 74.45, 102.70 and 43.35 is: 59.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.45 : 102.70 = 43.35 : x
  2. Step 2: Convert to fraction form
    74.45/102.70 = 43.35/x
  3. Step 3: Cross multiply
    74.45x = 102.70 × 43.35
  4. Step 4: Simplify right side
    74.45x = 4,452.41
  5. Step 5: Solve for x
    x = 4,452.41/74.45
  6. Step 6: Final answer
    x = 59.81

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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.