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Finding the Fourth Proportional to 210.94, 291.08 and 122.40

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Solution

The fourth proportional to 210.94, 291.08 and 122.40 is: 168.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.94 : 291.08 = 122.40 : x
  2. Step 2: Convert to fraction form
    210.94/291.08 = 122.40/x
  3. Step 3: Cross multiply
    210.94x = 291.08 × 122.40
  4. Step 4: Simplify right side
    210.94x = 35,628.50
  5. Step 5: Solve for x
    x = 35,628.50/210.94
  6. Step 6: Final answer
    x = 168.91

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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.