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Finding the Fourth Proportional to 138.12, 207.16 and 46.81

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Solution

The fourth proportional to 138.12, 207.16 and 46.81 is: 70.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.12 : 207.16 = 46.81 : x
  2. Step 2: Convert to fraction form
    138.12/207.16 = 46.81/x
  3. Step 3: Cross multiply
    138.12x = 207.16 × 46.81
  4. Step 4: Simplify right side
    138.12x = 9,697.16
  5. Step 5: Solve for x
    x = 9,697.16/138.12
  6. Step 6: Final answer
    x = 70.21

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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.