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Finding the Fourth Proportional to 210.75, 290.78 and 127.82

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Solution

The fourth proportional to 210.75, 290.78 and 127.82 is: 176.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.75 : 290.78 = 127.82 : x
  2. Step 2: Convert to fraction form
    210.75/290.78 = 127.82/x
  3. Step 3: Cross multiply
    210.75x = 290.78 × 127.82
  4. Step 4: Simplify right side
    210.75x = 37,165.41
  5. Step 5: Solve for x
    x = 37,165.41/210.75
  6. Step 6: Final answer
    x = 176.35

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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.