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Finding the Fourth Proportional to 231.04, 318.77 and 137.80

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Solution

The fourth proportional to 231.04, 318.77 and 137.80 is: 190.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.04 : 318.77 = 137.80 : x
  2. Step 2: Convert to fraction form
    231.04/318.77 = 137.80/x
  3. Step 3: Cross multiply
    231.04x = 318.77 × 137.80
  4. Step 4: Simplify right side
    231.04x = 43,926.51
  5. Step 5: Solve for x
    x = 43,926.51/231.04
  6. Step 6: Final answer
    x = 190.13

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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.