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Finding the Fourth Proportional to 64.92, 89.47 and 51.09

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Solution

The fourth proportional to 64.92, 89.47 and 51.09 is: 70.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.92 : 89.47 = 51.09 : x
  2. Step 2: Convert to fraction form
    64.92/89.47 = 51.09/x
  3. Step 3: Cross multiply
    64.92x = 89.47 × 51.09
  4. Step 4: Simplify right side
    64.92x = 4,571.02
  5. Step 5: Solve for x
    x = 4,571.02/64.92
  6. Step 6: Final answer
    x = 70.41

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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.