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Finding the Fourth Proportional to 279.86, 419.54 and 97.20

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Solution

The fourth proportional to 279.86, 419.54 and 97.20 is: 145.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.86 : 419.54 = 97.20 : x
  2. Step 2: Convert to fraction form
    279.86/419.54 = 97.20/x
  3. Step 3: Cross multiply
    279.86x = 419.54 × 97.20
  4. Step 4: Simplify right side
    279.86x = 40,779.29
  5. Step 5: Solve for x
    x = 40,779.29/279.86
  6. Step 6: Final answer
    x = 145.71

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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.