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Finding the Fourth Proportional to 153.36, 231.12 and 121.50

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Solution

The fourth proportional to 153.36, 231.12 and 121.50 is: 183.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.36 : 231.12 = 121.50 : x
  2. Step 2: Convert to fraction form
    153.36/231.12 = 121.50/x
  3. Step 3: Cross multiply
    153.36x = 231.12 × 121.50
  4. Step 4: Simplify right side
    153.36x = 28,081.08
  5. Step 5: Solve for x
    x = 28,081.08/153.36
  6. Step 6: Final answer
    x = 183.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.