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Finding the Fourth Proportional to 210.99, 291.15 and 123.68

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Solution

The fourth proportional to 210.99, 291.15 and 123.68 is: 170.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.99 : 291.15 = 123.68 : x
  2. Step 2: Convert to fraction form
    210.99/291.15 = 123.68/x
  3. Step 3: Cross multiply
    210.99x = 291.15 × 123.68
  4. Step 4: Simplify right side
    210.99x = 36,007.98
  5. Step 5: Solve for x
    x = 36,007.98/210.99
  6. Step 6: Final answer
    x = 170.66

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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.