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Finding the Fourth Proportional to 126.16, 174.04 and 74.40

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Solution

The fourth proportional to 126.16, 174.04 and 74.40 is: 102.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.16 : 174.04 = 74.40 : x
  2. Step 2: Convert to fraction form
    126.16/174.04 = 74.40/x
  3. Step 3: Cross multiply
    126.16x = 174.04 × 74.40
  4. Step 4: Simplify right side
    126.16x = 12,948.58
  5. Step 5: Solve for x
    x = 12,948.58/126.16
  6. Step 6: Final answer
    x = 102.64

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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.