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Finding the Fourth Proportional to 283.11, 390.54 and 189.88

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Solution

The fourth proportional to 283.11, 390.54 and 189.88 is: 261.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.11 : 390.54 = 189.88 : x
  2. Step 2: Convert to fraction form
    283.11/390.54 = 189.88/x
  3. Step 3: Cross multiply
    283.11x = 390.54 × 189.88
  4. Step 4: Simplify right side
    283.11x = 74,155.74
  5. Step 5: Solve for x
    x = 74,155.74/283.11
  6. Step 6: Final answer
    x = 261.93

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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.