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Finding the Fourth Proportional to 153.61, 211.74 and 120.36

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Solution

The fourth proportional to 153.61, 211.74 and 120.36 is: 165.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.61 : 211.74 = 120.36 : x
  2. Step 2: Convert to fraction form
    153.61/211.74 = 120.36/x
  3. Step 3: Cross multiply
    153.61x = 211.74 × 120.36
  4. Step 4: Simplify right side
    153.61x = 25,483.37
  5. Step 5: Solve for x
    x = 25,483.37/153.61
  6. Step 6: Final answer
    x = 165.90

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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.