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Finding the Fourth Proportional to 280.97, 421.30 and 142.00

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Solution

The fourth proportional to 280.97, 421.30 and 142.00 is: 212.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.97 : 421.30 = 142.00 : x
  2. Step 2: Convert to fraction form
    280.97/421.30 = 142.00/x
  3. Step 3: Cross multiply
    280.97x = 421.30 × 142.00
  4. Step 4: Simplify right side
    280.97x = 59,826.09
  5. Step 5: Solve for x
    x = 59,826.09/280.97
  6. Step 6: Final answer
    x = 212.93

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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.