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Finding the Fourth Proportional to 280.83, 420.78 and 183.21

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Solution

The fourth proportional to 280.83, 420.78 and 183.21 is: 274.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.83 : 420.78 = 183.21 : x
  2. Step 2: Convert to fraction form
    280.83/420.78 = 183.21/x
  3. Step 3: Cross multiply
    280.83x = 420.78 × 183.21
  4. Step 4: Simplify right side
    280.83x = 77,089.00
  5. Step 5: Solve for x
    x = 77,089.00/280.83
  6. Step 6: Final answer
    x = 274.51

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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.