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Finding the Fourth Proportional to 64.65, 96.78 and 45.36

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Solution

The fourth proportional to 64.65, 96.78 and 45.36 is: 67.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.65 : 96.78 = 45.36 : x
  2. Step 2: Convert to fraction form
    64.65/96.78 = 45.36/x
  3. Step 3: Cross multiply
    64.65x = 96.78 × 45.36
  4. Step 4: Simplify right side
    64.65x = 4,389.94
  5. Step 5: Solve for x
    x = 4,389.94/64.65
  6. Step 6: Final answer
    x = 67.90

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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.