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Finding the Fourth Proportional to 102.80, 140.64 and 102.48

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Solution

The fourth proportional to 102.80, 140.64 and 102.48 is: 140.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.80 : 140.64 = 102.48 : x
  2. Step 2: Convert to fraction form
    102.80/140.64 = 102.48/x
  3. Step 3: Cross multiply
    102.80x = 140.64 × 102.48
  4. Step 4: Simplify right side
    102.80x = 14,412.79
  5. Step 5: Solve for x
    x = 14,412.79/102.80
  6. Step 6: Final answer
    x = 140.20

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.