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Finding the Fourth Proportional to 280, 386.40 and 161.98

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Solution

The fourth proportional to 280, 386.40 and 161.98 is: 223.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    280 : 386.40 = 161.98 : x
  2. Step 2: Convert to fraction form
    280/386.40 = 161.98/x
  3. Step 3: Cross multiply
    280x = 386.40 × 161.98
  4. Step 4: Simplify right side
    280x = 62,589.07
  5. Step 5: Solve for x
    x = 62,589.07/280
  6. Step 6: Final answer
    x = 223.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.