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Finding the Fourth Proportional to 64.29, 96.45 and 28.20

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Solution

The fourth proportional to 64.29, 96.45 and 28.20 is: 42.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.29 : 96.45 = 28.20 : x
  2. Step 2: Convert to fraction form
    64.29/96.45 = 28.20/x
  3. Step 3: Cross multiply
    64.29x = 96.45 × 28.20
  4. Step 4: Simplify right side
    64.29x = 2,719.75
  5. Step 5: Solve for x
    x = 2,719.75/64.29
  6. Step 6: Final answer
    x = 42.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.