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Finding the Fourth Proportional to 152.33, 210.09 and 121.20

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Solution

The fourth proportional to 152.33, 210.09 and 121.20 is: 167.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.33 : 210.09 = 121.20 : x
  2. Step 2: Convert to fraction form
    152.33/210.09 = 121.20/x
  3. Step 3: Cross multiply
    152.33x = 210.09 × 121.20
  4. Step 4: Simplify right side
    152.33x = 25,462.91
  5. Step 5: Solve for x
    x = 25,462.91/152.33
  6. Step 6: Final answer
    x = 167.16

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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.