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Finding the Fourth Proportional to 172.55, 257.33 and 147.04

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Solution

The fourth proportional to 172.55, 257.33 and 147.04 is: 219.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.55 : 257.33 = 147.04 : x
  2. Step 2: Convert to fraction form
    172.55/257.33 = 147.04/x
  3. Step 3: Cross multiply
    172.55x = 257.33 × 147.04
  4. Step 4: Simplify right side
    172.55x = 37,836.52
  5. Step 5: Solve for x
    x = 37,836.52/172.55
  6. Step 6: Final answer
    x = 219.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.