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Finding the Fourth Proportional to 207.96, 312 and 86.16

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Solution

The fourth proportional to 207.96, 312 and 86.16 is: 129.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.96 : 312 = 86.16 : x
  2. Step 2: Convert to fraction form
    207.96/312 = 86.16/x
  3. Step 3: Cross multiply
    207.96x = 312 × 86.16
  4. Step 4: Simplify right side
    207.96x = 26,881.92
  5. Step 5: Solve for x
    x = 26,881.92/207.96
  6. Step 6: Final answer
    x = 129.26

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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.