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Finding the Fourth Proportional to 231.55, 318.80 and 220

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Solution

The fourth proportional to 231.55, 318.80 and 220 is: 302.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.55 : 318.80 = 220 : x
  2. Step 2: Convert to fraction form
    231.55/318.80 = 220/x
  3. Step 3: Cross multiply
    231.55x = 318.80 × 220
  4. Step 4: Simplify right side
    231.55x = 70,136
  5. Step 5: Solve for x
    x = 70,136/231.55
  6. Step 6: Final answer
    x = 302.90

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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.