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Finding the Fourth Proportional to 279.86, 419.76 and 142.89

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Solution

The fourth proportional to 279.86, 419.76 and 142.89 is: 214.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.86 : 419.76 = 142.89 : x
  2. Step 2: Convert to fraction form
    279.86/419.76 = 142.89/x
  3. Step 3: Cross multiply
    279.86x = 419.76 × 142.89
  4. Step 4: Simplify right side
    279.86x = 59,979.51
  5. Step 5: Solve for x
    x = 59,979.51/279.86
  6. Step 6: Final answer
    x = 214.32

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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.