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Finding the Fourth Proportional to 279.85, 420.59 and 135.67

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Solution

The fourth proportional to 279.85, 420.59 and 135.67 is: 203.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.85 : 420.59 = 135.67 : x
  2. Step 2: Convert to fraction form
    279.85/420.59 = 135.67/x
  3. Step 3: Cross multiply
    279.85x = 420.59 × 135.67
  4. Step 4: Simplify right side
    279.85x = 57,061.45
  5. Step 5: Solve for x
    x = 57,061.45/279.85
  6. Step 6: Final answer
    x = 203.90

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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.