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Finding the Fourth Proportional to 64.12, 96.12 and 40.70

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Solution

The fourth proportional to 64.12, 96.12 and 40.70 is: 61.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.12 : 96.12 = 40.70 : x
  2. Step 2: Convert to fraction form
    64.12/96.12 = 40.70/x
  3. Step 3: Cross multiply
    64.12x = 96.12 × 40.70
  4. Step 4: Simplify right side
    64.12x = 3,912.08
  5. Step 5: Solve for x
    x = 3,912.08/64.12
  6. Step 6: Final answer
    x = 61.01

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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.