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Finding the Fourth Proportional to 172.08, 257.80 and 153.99

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Solution

The fourth proportional to 172.08, 257.80 and 153.99 is: 230.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.08 : 257.80 = 153.99 : x
  2. Step 2: Convert to fraction form
    172.08/257.80 = 153.99/x
  3. Step 3: Cross multiply
    172.08x = 257.80 × 153.99
  4. Step 4: Simplify right side
    172.08x = 39,698.62
  5. Step 5: Solve for x
    x = 39,698.62/172.08
  6. Step 6: Final answer
    x = 230.70

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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.