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Finding the Fourth Proportional to 207.60, 312.85 and 187.06

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Solution

The fourth proportional to 207.60, 312.85 and 187.06 is: 281.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.60 : 312.85 = 187.06 : x
  2. Step 2: Convert to fraction form
    207.60/312.85 = 187.06/x
  3. Step 3: Cross multiply
    207.60x = 312.85 × 187.06
  4. Step 4: Simplify right side
    207.60x = 58,520.16
  5. Step 5: Solve for x
    x = 58,520.16/207.60
  6. Step 6: Final answer
    x = 281.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.