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Finding the Fourth Proportional to 339.18, 505.79 and 290.67

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Solution

The fourth proportional to 339.18, 505.79 and 290.67 is: 433.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.18 : 505.79 = 290.67 : x
  2. Step 2: Convert to fraction form
    339.18/505.79 = 290.67/x
  3. Step 3: Cross multiply
    339.18x = 505.79 × 290.67
  4. Step 4: Simplify right side
    339.18x = 147,016.53
  5. Step 5: Solve for x
    x = 147,016.53/339.18
  6. Step 6: Final answer
    x = 433.45

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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.