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Finding the Fourth Proportional to 390.58, 585.80 and 130.59

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Solution

The fourth proportional to 390.58, 585.80 and 130.59 is: 195.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.58 : 585.80 = 130.59 : x
  2. Step 2: Convert to fraction form
    390.58/585.80 = 130.59/x
  3. Step 3: Cross multiply
    390.58x = 585.80 × 130.59
  4. Step 4: Simplify right side
    390.58x = 76,499.62
  5. Step 5: Solve for x
    x = 76,499.62/390.58
  6. Step 6: Final answer
    x = 195.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.