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Finding the Fourth Proportional to 390.74, 586.17 and 130.69

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Solution

The fourth proportional to 390.74, 586.17 and 130.69 is: 196.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.74 : 586.17 = 130.69 : x
  2. Step 2: Convert to fraction form
    390.74/586.17 = 130.69/x
  3. Step 3: Cross multiply
    390.74x = 586.17 × 130.69
  4. Step 4: Simplify right side
    390.74x = 76,608.02
  5. Step 5: Solve for x
    x = 76,608.02/390.74
  6. Step 6: Final answer
    x = 196.06

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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.