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Finding the Fourth Proportional to 279.89, 420.08 and 143.03

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Solution

The fourth proportional to 279.89, 420.08 and 143.03 is: 214.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.89 : 420.08 = 143.03 : x
  2. Step 2: Convert to fraction form
    279.89/420.08 = 143.03/x
  3. Step 3: Cross multiply
    279.89x = 420.08 × 143.03
  4. Step 4: Simplify right side
    279.89x = 60,081.23
  5. Step 5: Solve for x
    x = 60,081.23/279.89
  6. Step 6: Final answer
    x = 214.66

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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.