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Finding the Fourth Proportional to 64.55, 96.85 and 21.23

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Solution

The fourth proportional to 64.55, 96.85 and 21.23 is: 31.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.55 : 96.85 = 21.23 : x
  2. Step 2: Convert to fraction form
    64.55/96.85 = 21.23/x
  3. Step 3: Cross multiply
    64.55x = 96.85 × 21.23
  4. Step 4: Simplify right side
    64.55x = 2,055.82
  5. Step 5: Solve for x
    x = 2,055.82/64.55
  6. Step 6: Final answer
    x = 31.85

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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.