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Finding the Fourth Proportional to 309.08, 464.60 and 172.40

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Solution

The fourth proportional to 309.08, 464.60 and 172.40 is: 259.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.08 : 464.60 = 172.40 : x
  2. Step 2: Convert to fraction form
    309.08/464.60 = 172.40/x
  3. Step 3: Cross multiply
    309.08x = 464.60 × 172.40
  4. Step 4: Simplify right side
    309.08x = 80,095.15
  5. Step 5: Solve for x
    x = 80,095.15/309.08
  6. Step 6: Final answer
    x = 259.14

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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.