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Finding the Fourth Proportional to 147.12, 202.88 and 103.44

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Solution

The fourth proportional to 147.12, 202.88 and 103.44 is: 142.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.12 : 202.88 = 103.44 : x
  2. Step 2: Convert to fraction form
    147.12/202.88 = 103.44/x
  3. Step 3: Cross multiply
    147.12x = 202.88 × 103.44
  4. Step 4: Simplify right side
    147.12x = 20,985.91
  5. Step 5: Solve for x
    x = 20,985.91/147.12
  6. Step 6: Final answer
    x = 142.64

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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.