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Finding the Fourth Proportional to 117.21, 162.53 and 111.06

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Solution

The fourth proportional to 117.21, 162.53 and 111.06 is: 154.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.21 : 162.53 = 111.06 : x
  2. Step 2: Convert to fraction form
    117.21/162.53 = 111.06/x
  3. Step 3: Cross multiply
    117.21x = 162.53 × 111.06
  4. Step 4: Simplify right side
    117.21x = 18,050.03
  5. Step 5: Solve for x
    x = 18,050.03/117.21
  6. Step 6: Final answer
    x = 154.00

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.