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Finding the Fourth Proportional to 97.20, 128.52 and 97.20

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Solution

The fourth proportional to 97.20, 128.52 and 97.20 is: 128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.20 : 128.52 = 97.20 : x
  2. Step 2: Convert to fraction form
    97.20/128.52 = 97.20/x
  3. Step 3: Cross multiply
    97.20x = 128.52 × 97.20
  4. Step 4: Simplify right side
    97.20x = 12,492.14
  5. Step 5: Solve for x
    x = 12,492.14/97.20
  6. Step 6: Final answer
    x = 128.52

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.