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Finding the Fourth Proportional to 153.77, 212.41 and 122.90

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Solution

The fourth proportional to 153.77, 212.41 and 122.90 is: 169.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.77 : 212.41 = 122.90 : x
  2. Step 2: Convert to fraction form
    153.77/212.41 = 122.90/x
  3. Step 3: Cross multiply
    153.77x = 212.41 × 122.90
  4. Step 4: Simplify right side
    153.77x = 26,106.45
  5. Step 5: Solve for x
    x = 26,106.45/153.77
  6. Step 6: Final answer
    x = 169.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.