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Finding the Fourth Proportional to 390.15, 538.47 and 232.88

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Solution

The fourth proportional to 390.15, 538.47 and 232.88 is: 321.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.15 : 538.47 = 232.88 : x
  2. Step 2: Convert to fraction form
    390.15/538.47 = 232.88/x
  3. Step 3: Cross multiply
    390.15x = 538.47 × 232.88
  4. Step 4: Simplify right side
    390.15x = 125,396.20
  5. Step 5: Solve for x
    x = 125,396.20/390.15
  6. Step 6: Final answer
    x = 321.41

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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.