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Finding the Fourth Proportional to 197.10, 294.51 and 172.40

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Solution

The fourth proportional to 197.10, 294.51 and 172.40 is: 257.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.10 : 294.51 = 172.40 : x
  2. Step 2: Convert to fraction form
    197.10/294.51 = 172.40/x
  3. Step 3: Cross multiply
    197.10x = 294.51 × 172.40
  4. Step 4: Simplify right side
    197.10x = 50,773.52
  5. Step 5: Solve for x
    x = 50,773.52/197.10
  6. Step 6: Final answer
    x = 257.60

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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.