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Finding the Fourth Proportional to 172.06, 256.98 and 155.78

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Solution

The fourth proportional to 172.06, 256.98 and 155.78 is: 232.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.06 : 256.98 = 155.78 : x
  2. Step 2: Convert to fraction form
    172.06/256.98 = 155.78/x
  3. Step 3: Cross multiply
    172.06x = 256.98 × 155.78
  4. Step 4: Simplify right side
    172.06x = 40,032.34
  5. Step 5: Solve for x
    x = 40,032.34/172.06
  6. Step 6: Final answer
    x = 232.67

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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.