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Finding the Fourth Proportional to 64.81, 89.35 and 53.11

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Solution

The fourth proportional to 64.81, 89.35 and 53.11 is: 73.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.81 : 89.35 = 53.11 : x
  2. Step 2: Convert to fraction form
    64.81/89.35 = 53.11/x
  3. Step 3: Cross multiply
    64.81x = 89.35 × 53.11
  4. Step 4: Simplify right side
    64.81x = 4,745.38
  5. Step 5: Solve for x
    x = 4,745.38/64.81
  6. Step 6: Final answer
    x = 73.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.