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Finding the Fourth Proportional to 64.51, 89.05 and 61.25

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Solution

The fourth proportional to 64.51, 89.05 and 61.25 is: 84.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.51 : 89.05 = 61.25 : x
  2. Step 2: Convert to fraction form
    64.51/89.05 = 61.25/x
  3. Step 3: Cross multiply
    64.51x = 89.05 × 61.25
  4. Step 4: Simplify right side
    64.51x = 5,453.56
  5. Step 5: Solve for x
    x = 5,453.56/64.51
  6. Step 6: Final answer
    x = 84.54

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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.