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Finding the Fourth Proportional to 64.84, 97.40 and 61.38

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Solution

The fourth proportional to 64.84, 97.40 and 61.38 is: 92.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.84 : 97.40 = 61.38 : x
  2. Step 2: Convert to fraction form
    64.84/97.40 = 61.38/x
  3. Step 3: Cross multiply
    64.84x = 97.40 × 61.38
  4. Step 4: Simplify right side
    64.84x = 5,978.41
  5. Step 5: Solve for x
    x = 5,978.41/64.84
  6. Step 6: Final answer
    x = 92.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.