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Finding the Fourth Proportional to 74.37, 112.03 and 66.98

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Solution

The fourth proportional to 74.37, 112.03 and 66.98 is: 100.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.37 : 112.03 = 66.98 : x
  2. Step 2: Convert to fraction form
    74.37/112.03 = 66.98/x
  3. Step 3: Cross multiply
    74.37x = 112.03 × 66.98
  4. Step 4: Simplify right side
    74.37x = 7,503.63
  5. Step 5: Solve for x
    x = 7,503.63/74.37
  6. Step 6: Final answer
    x = 100.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.