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Finding the Fourth Proportional to 138.43, 207.54 and 70.01

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Solution

The fourth proportional to 138.43, 207.54 and 70.01 is: 104.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.43 : 207.54 = 70.01 : x
  2. Step 2: Convert to fraction form
    138.43/207.54 = 70.01/x
  3. Step 3: Cross multiply
    138.43x = 207.54 × 70.01
  4. Step 4: Simplify right side
    138.43x = 14,528.49
  5. Step 5: Solve for x
    x = 14,528.49/138.43
  6. Step 6: Final answer
    x = 104.95

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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.