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Finding the Fourth Proportional to 66.31, 98.94 and 64.76

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Solution

The fourth proportional to 66.31, 98.94 and 64.76 is: 96.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.31 : 98.94 = 64.76 : x
  2. Step 2: Convert to fraction form
    66.31/98.94 = 64.76/x
  3. Step 3: Cross multiply
    66.31x = 98.94 × 64.76
  4. Step 4: Simplify right side
    66.31x = 6,407.35
  5. Step 5: Solve for x
    x = 6,407.35/66.31
  6. Step 6: Final answer
    x = 96.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.