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Finding the Fourth Proportional to 280.73, 420.74 and 118.22

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Solution

The fourth proportional to 280.73, 420.74 and 118.22 is: 177.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.73 : 420.74 = 118.22 : x
  2. Step 2: Convert to fraction form
    280.73/420.74 = 118.22/x
  3. Step 3: Cross multiply
    280.73x = 420.74 × 118.22
  4. Step 4: Simplify right side
    280.73x = 49,737.19
  5. Step 5: Solve for x
    x = 49,737.19/280.73
  6. Step 6: Final answer
    x = 177.17

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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.