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Finding the Fourth Proportional to 310.62, 428 and 261.60

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Solution

The fourth proportional to 310.62, 428 and 261.60 is: 360.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.62 : 428 = 261.60 : x
  2. Step 2: Convert to fraction form
    310.62/428 = 261.60/x
  3. Step 3: Cross multiply
    310.62x = 428 × 261.60
  4. Step 4: Simplify right side
    310.62x = 111,964.80
  5. Step 5: Solve for x
    x = 111,964.80/310.62
  6. Step 6: Final answer
    x = 360.46

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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.