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Finding the Fourth Proportional to 64.36, 96.56 and 18.72

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Solution

The fourth proportional to 64.36, 96.56 and 18.72 is: 28.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.36 : 96.56 = 18.72 : x
  2. Step 2: Convert to fraction form
    64.36/96.56 = 18.72/x
  3. Step 3: Cross multiply
    64.36x = 96.56 × 18.72
  4. Step 4: Simplify right side
    64.36x = 1,807.12
  5. Step 5: Solve for x
    x = 1,807.12/64.36
  6. Step 6: Final answer
    x = 28.08

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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.