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Finding the Fourth Proportional to 279.93, 419.96 and 142.98

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Solution

The fourth proportional to 279.93, 419.96 and 142.98 is: 214.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.93 : 419.96 = 142.98 : x
  2. Step 2: Convert to fraction form
    279.93/419.96 = 142.98/x
  3. Step 3: Cross multiply
    279.93x = 419.96 × 142.98
  4. Step 4: Simplify right side
    279.93x = 60,045.88
  5. Step 5: Solve for x
    x = 60,045.88/279.93
  6. Step 6: Final answer
    x = 214.50

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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.