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Finding the Fourth Proportional to 64.03, 95.55 and 57.21

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Solution

The fourth proportional to 64.03, 95.55 and 57.21 is: 85.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.03 : 95.55 = 57.21 : x
  2. Step 2: Convert to fraction form
    64.03/95.55 = 57.21/x
  3. Step 3: Cross multiply
    64.03x = 95.55 × 57.21
  4. Step 4: Simplify right side
    64.03x = 5,466.42
  5. Step 5: Solve for x
    x = 5,466.42/64.03
  6. Step 6: Final answer
    x = 85.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.