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Finding the Fourth Proportional to 64.11, 88.31 and 60.80

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Solution

The fourth proportional to 64.11, 88.31 and 60.80 is: 83.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.11 : 88.31 = 60.80 : x
  2. Step 2: Convert to fraction form
    64.11/88.31 = 60.80/x
  3. Step 3: Cross multiply
    64.11x = 88.31 × 60.80
  4. Step 4: Simplify right side
    64.11x = 5,368.50
  5. Step 5: Solve for x
    x = 5,368.50/64.11
  6. Step 6: Final answer
    x = 83.74

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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.