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Finding the Fourth Proportional to 74.18, 102.45 and 65.46

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Solution

The fourth proportional to 74.18, 102.45 and 65.46 is: 90.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.18 : 102.45 = 65.46 : x
  2. Step 2: Convert to fraction form
    74.18/102.45 = 65.46/x
  3. Step 3: Cross multiply
    74.18x = 102.45 × 65.46
  4. Step 4: Simplify right side
    74.18x = 6,706.38
  5. Step 5: Solve for x
    x = 6,706.38/74.18
  6. Step 6: Final answer
    x = 90.41

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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.