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Finding the Fourth Proportional to 339.56, 509.70 and 259.28

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Solution

The fourth proportional to 339.56, 509.70 and 259.28 is: 389.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.56 : 509.70 = 259.28 : x
  2. Step 2: Convert to fraction form
    339.56/509.70 = 259.28/x
  3. Step 3: Cross multiply
    339.56x = 509.70 × 259.28
  4. Step 4: Simplify right side
    339.56x = 132,155.02
  5. Step 5: Solve for x
    x = 132,155.02/339.56
  6. Step 6: Final answer
    x = 389.19

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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.