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Finding the Fourth Proportional to 339.63, 509.04 and 285.36

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Solution

The fourth proportional to 339.63, 509.04 and 285.36 is: 427.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.63 : 509.04 = 285.36 : x
  2. Step 2: Convert to fraction form
    339.63/509.04 = 285.36/x
  3. Step 3: Cross multiply
    339.63x = 509.04 × 285.36
  4. Step 4: Simplify right side
    339.63x = 145,259.65
  5. Step 5: Solve for x
    x = 145,259.65/339.63
  6. Step 6: Final answer
    x = 427.70

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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.