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Finding the Fourth Proportional to 64.30, 96.40 and 28.22

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Solution

The fourth proportional to 64.30, 96.40 and 28.22 is: 42.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.30 : 96.40 = 28.22 : x
  2. Step 2: Convert to fraction form
    64.30/96.40 = 28.22/x
  3. Step 3: Cross multiply
    64.30x = 96.40 × 28.22
  4. Step 4: Simplify right side
    64.30x = 2,720.41
  5. Step 5: Solve for x
    x = 2,720.41/64.30
  6. Step 6: Final answer
    x = 42.31

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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.