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Finding the Fourth Proportional to 210.73, 290.84 and 123.40

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Solution

The fourth proportional to 210.73, 290.84 and 123.40 is: 170.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.73 : 290.84 = 123.40 : x
  2. Step 2: Convert to fraction form
    210.73/290.84 = 123.40/x
  3. Step 3: Cross multiply
    210.73x = 290.84 × 123.40
  4. Step 4: Simplify right side
    210.73x = 35,889.28
  5. Step 5: Solve for x
    x = 35,889.28/210.73
  6. Step 6: Final answer
    x = 170.31

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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.