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Finding the Fourth Proportional to 74.30, 102.45 and 63.22

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Solution

The fourth proportional to 74.30, 102.45 and 63.22 is: 87.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.30 : 102.45 = 63.22 : x
  2. Step 2: Convert to fraction form
    74.30/102.45 = 63.22/x
  3. Step 3: Cross multiply
    74.30x = 102.45 × 63.22
  4. Step 4: Simplify right side
    74.30x = 6,476.63
  5. Step 5: Solve for x
    x = 6,476.63/74.30
  6. Step 6: Final answer
    x = 87.17

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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.