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Finding the Fourth Proportional to 210.79, 290.91 and 127.99

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Solution

The fourth proportional to 210.79, 290.91 and 127.99 is: 176.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.79 : 290.91 = 127.99 : x
  2. Step 2: Convert to fraction form
    210.79/290.91 = 127.99/x
  3. Step 3: Cross multiply
    210.79x = 290.91 × 127.99
  4. Step 4: Simplify right side
    210.79x = 37,233.57
  5. Step 5: Solve for x
    x = 37,233.57/210.79
  6. Step 6: Final answer
    x = 176.64

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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.