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Finding the Fourth Proportional to 280.67, 421.00 and 172.13

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Solution

The fourth proportional to 280.67, 421.00 and 172.13 is: 258.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.67 : 421.00 = 172.13 : x
  2. Step 2: Convert to fraction form
    280.67/421.00 = 172.13/x
  3. Step 3: Cross multiply
    280.67x = 421.00 × 172.13
  4. Step 4: Simplify right side
    280.67x = 72,464.19
  5. Step 5: Solve for x
    x = 72,464.19/280.67
  6. Step 6: Final answer
    x = 258.19

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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.