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Finding the Fourth Proportional to 126.45, 174.53 and 74

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Solution

The fourth proportional to 126.45, 174.53 and 74 is: 102.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.45 : 174.53 = 74 : x
  2. Step 2: Convert to fraction form
    126.45/174.53 = 74/x
  3. Step 3: Cross multiply
    126.45x = 174.53 × 74
  4. Step 4: Simplify right side
    126.45x = 12,915.22
  5. Step 5: Solve for x
    x = 12,915.22/126.45
  6. Step 6: Final answer
    x = 102.14

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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.