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Finding the Fourth Proportional to 64.82, 89.38 and 55.64

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Solution

The fourth proportional to 64.82, 89.38 and 55.64 is: 76.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.82 : 89.38 = 55.64 : x
  2. Step 2: Convert to fraction form
    64.82/89.38 = 55.64/x
  3. Step 3: Cross multiply
    64.82x = 89.38 × 55.64
  4. Step 4: Simplify right side
    64.82x = 4,973.10
  5. Step 5: Solve for x
    x = 4,973.10/64.82
  6. Step 6: Final answer
    x = 76.72

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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.