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Finding the Fourth Proportional to 207.04, 285.76 and 138

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Solution

The fourth proportional to 207.04, 285.76 and 138 is: 190.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.04 : 285.76 = 138 : x
  2. Step 2: Convert to fraction form
    207.04/285.76 = 138/x
  3. Step 3: Cross multiply
    207.04x = 285.76 × 138
  4. Step 4: Simplify right side
    207.04x = 39,434.88
  5. Step 5: Solve for x
    x = 39,434.88/207.04
  6. Step 6: Final answer
    x = 190.47

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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.