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Finding the Fourth Proportional to 388.40, 536.03 and 231.07

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Solution

The fourth proportional to 388.40, 536.03 and 231.07 is: 318.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.40 : 536.03 = 231.07 : x
  2. Step 2: Convert to fraction form
    388.40/536.03 = 231.07/x
  3. Step 3: Cross multiply
    388.40x = 536.03 × 231.07
  4. Step 4: Simplify right side
    388.40x = 123,860.45
  5. Step 5: Solve for x
    x = 123,860.45/388.40
  6. Step 6: Final answer
    x = 318.90

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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.