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Finding the Fourth Proportional to 210.58, 290.56 and 155.38

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Solution

The fourth proportional to 210.58, 290.56 and 155.38 is: 214.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.58 : 290.56 = 155.38 : x
  2. Step 2: Convert to fraction form
    210.58/290.56 = 155.38/x
  3. Step 3: Cross multiply
    210.58x = 290.56 × 155.38
  4. Step 4: Simplify right side
    210.58x = 45,147.21
  5. Step 5: Solve for x
    x = 45,147.21/210.58
  6. Step 6: Final answer
    x = 214.39

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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.