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Finding the Fourth Proportional to 309.30, 464.76 and 172.55

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Solution

The fourth proportional to 309.30, 464.76 and 172.55 is: 259.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.30 : 464.76 = 172.55 : x
  2. Step 2: Convert to fraction form
    309.30/464.76 = 172.55/x
  3. Step 3: Cross multiply
    309.30x = 464.76 × 172.55
  4. Step 4: Simplify right side
    309.30x = 80,192.01
  5. Step 5: Solve for x
    x = 80,192.01/309.30
  6. Step 6: Final answer
    x = 259.27

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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.