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Finding the Fourth Proportional to 74.46, 112.31 and 66.63

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Solution

The fourth proportional to 74.46, 112.31 and 66.63 is: 100.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.46 : 112.31 = 66.63 : x
  2. Step 2: Convert to fraction form
    74.46/112.31 = 66.63/x
  3. Step 3: Cross multiply
    74.46x = 112.31 × 66.63
  4. Step 4: Simplify right side
    74.46x = 7,482.88
  5. Step 5: Solve for x
    x = 7,482.88/74.46
  6. Step 6: Final answer
    x = 100.50

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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.