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Finding the Fourth Proportional to 64.65, 89.22 and 64.50

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Solution

The fourth proportional to 64.65, 89.22 and 64.50 is: 89.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.65 : 89.22 = 64.50 : x
  2. Step 2: Convert to fraction form
    64.65/89.22 = 64.50/x
  3. Step 3: Cross multiply
    64.65x = 89.22 × 64.50
  4. Step 4: Simplify right side
    64.65x = 5,754.69
  5. Step 5: Solve for x
    x = 5,754.69/64.65
  6. Step 6: Final answer
    x = 89.01

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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.