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Finding the Fourth Proportional to 74.31, 102.56 and 45.21

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Solution

The fourth proportional to 74.31, 102.56 and 45.21 is: 62.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.31 : 102.56 = 45.21 : x
  2. Step 2: Convert to fraction form
    74.31/102.56 = 45.21/x
  3. Step 3: Cross multiply
    74.31x = 102.56 × 45.21
  4. Step 4: Simplify right side
    74.31x = 4,636.00
  5. Step 5: Solve for x
    x = 4,636.00/74.31
  6. Step 6: Final answer
    x = 62.39

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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.