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Finding the Fourth Proportional to 391.07, 585.21 and 340.26

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Solution

The fourth proportional to 391.07, 585.21 and 340.26 is: 509.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.07 : 585.21 = 340.26 : x
  2. Step 2: Convert to fraction form
    391.07/585.21 = 340.26/x
  3. Step 3: Cross multiply
    391.07x = 585.21 × 340.26
  4. Step 4: Simplify right side
    391.07x = 199,123.55
  5. Step 5: Solve for x
    x = 199,123.55/391.07
  6. Step 6: Final answer
    x = 509.18

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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.