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Finding the Fourth Proportional to 169.40, 233.76 and 111.20

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Solution

The fourth proportional to 169.40, 233.76 and 111.20 is: 153.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.40 : 233.76 = 111.20 : x
  2. Step 2: Convert to fraction form
    169.40/233.76 = 111.20/x
  3. Step 3: Cross multiply
    169.40x = 233.76 × 111.20
  4. Step 4: Simplify right side
    169.40x = 25,994.11
  5. Step 5: Solve for x
    x = 25,994.11/169.40
  6. Step 6: Final answer
    x = 153.45

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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.