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Finding the Fourth Proportional to 207.12, 285.76 and 137.20

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Solution

The fourth proportional to 207.12, 285.76 and 137.20 is: 189.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.12 : 285.76 = 137.20 : x
  2. Step 2: Convert to fraction form
    207.12/285.76 = 137.20/x
  3. Step 3: Cross multiply
    207.12x = 285.76 × 137.20
  4. Step 4: Simplify right side
    207.12x = 39,206.27
  5. Step 5: Solve for x
    x = 39,206.27/207.12
  6. Step 6: Final answer
    x = 189.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.