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Finding the Fourth Proportional to 65.42, 98.66 and 64.21

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Solution

The fourth proportional to 65.42, 98.66 and 64.21 is: 96.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.42 : 98.66 = 64.21 : x
  2. Step 2: Convert to fraction form
    65.42/98.66 = 64.21/x
  3. Step 3: Cross multiply
    65.42x = 98.66 × 64.21
  4. Step 4: Simplify right side
    65.42x = 6,334.39
  5. Step 5: Solve for x
    x = 6,334.39/65.42
  6. Step 6: Final answer
    x = 96.82

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.