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Finding the Fourth Proportional to 859.59, 1,289.19 and 339.42

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Solution

The fourth proportional to 859.59, 1,289.19 and 339.42 is: 509.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.59 : 1,289.19 = 339.42 : x
  2. Step 2: Convert to fraction form
    859.59/1,289.19 = 339.42/x
  3. Step 3: Cross multiply
    859.59x = 1,289.19 × 339.42
  4. Step 4: Simplify right side
    859.59x = 437,576.87
  5. Step 5: Solve for x
    x = 437,576.87/859.59
  6. Step 6: Final answer
    x = 509.05

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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.