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Finding the Fourth Proportional to 172.04, 257.85 and 74.52

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Solution

The fourth proportional to 172.04, 257.85 and 74.52 is: 111.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.04 : 257.85 = 74.52 : x
  2. Step 2: Convert to fraction form
    172.04/257.85 = 74.52/x
  3. Step 3: Cross multiply
    172.04x = 257.85 × 74.52
  4. Step 4: Simplify right side
    172.04x = 19,214.98
  5. Step 5: Solve for x
    x = 19,214.98/172.04
  6. Step 6: Final answer
    x = 111.69

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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.