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Finding the Fourth Proportional to 309.76, 464.29 and 172.77

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Solution

The fourth proportional to 309.76, 464.29 and 172.77 is: 258.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.76 : 464.29 = 172.77 : x
  2. Step 2: Convert to fraction form
    309.76/464.29 = 172.77/x
  3. Step 3: Cross multiply
    309.76x = 464.29 × 172.77
  4. Step 4: Simplify right side
    309.76x = 80,215.38
  5. Step 5: Solve for x
    x = 80,215.38/309.76
  6. Step 6: Final answer
    x = 258.96

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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.