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Finding the Fourth Proportional to 390.41, 585.65 and 130.42

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Solution

The fourth proportional to 390.41, 585.65 and 130.42 is: 195.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.41 : 585.65 = 130.42 : x
  2. Step 2: Convert to fraction form
    390.41/585.65 = 130.42/x
  3. Step 3: Cross multiply
    390.41x = 585.65 × 130.42
  4. Step 4: Simplify right side
    390.41x = 76,381.90
  5. Step 5: Solve for x
    x = 76,381.90/390.41
  6. Step 6: Final answer
    x = 195.64

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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.