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Finding the Fourth Proportional to 391.30, 584.37 and 340.10

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Solution

The fourth proportional to 391.30, 584.37 and 340.10 is: 507.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.30 : 584.37 = 340.10 : x
  2. Step 2: Convert to fraction form
    391.30/584.37 = 340.10/x
  3. Step 3: Cross multiply
    391.30x = 584.37 × 340.10
  4. Step 4: Simplify right side
    391.30x = 198,744.24
  5. Step 5: Solve for x
    x = 198,744.24/391.30
  6. Step 6: Final answer
    x = 507.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.