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Finding the Fourth Proportional to 388.60, 536.12 and 231.15

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Solution

The fourth proportional to 388.60, 536.12 and 231.15 is: 318.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.60 : 536.12 = 231.15 : x
  2. Step 2: Convert to fraction form
    388.60/536.12 = 231.15/x
  3. Step 3: Cross multiply
    388.60x = 536.12 × 231.15
  4. Step 4: Simplify right side
    388.60x = 123,925.86
  5. Step 5: Solve for x
    x = 123,925.86/388.60
  6. Step 6: Final answer
    x = 318.91

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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.