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Finding the Fourth Proportional to 64.21, 96.19 and 55.56

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Solution

The fourth proportional to 64.21, 96.19 and 55.56 is: 83.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.21 : 96.19 = 55.56 : x
  2. Step 2: Convert to fraction form
    64.21/96.19 = 55.56/x
  3. Step 3: Cross multiply
    64.21x = 96.19 × 55.56
  4. Step 4: Simplify right side
    64.21x = 5,343.56
  5. Step 5: Solve for x
    x = 5,343.56/64.21
  6. Step 6: Final answer
    x = 83.23

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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.