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Finding the Fourth Proportional to 262.12, 392.34 and 189.64

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Solution

The fourth proportional to 262.12, 392.34 and 189.64 is: 283.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.12 : 392.34 = 189.64 : x
  2. Step 2: Convert to fraction form
    262.12/392.34 = 189.64/x
  3. Step 3: Cross multiply
    262.12x = 392.34 × 189.64
  4. Step 4: Simplify right side
    262.12x = 74,403.36
  5. Step 5: Solve for x
    x = 74,403.36/262.12
  6. Step 6: Final answer
    x = 283.85

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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.