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Finding the Fourth Proportional to 859.37, 1,289.36 and 339.08

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Solution

The fourth proportional to 859.37, 1,289.36 and 339.08 is: 508.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.37 : 1,289.36 = 339.08 : x
  2. Step 2: Convert to fraction form
    859.37/1,289.36 = 339.08/x
  3. Step 3: Cross multiply
    859.37x = 1,289.36 × 339.08
  4. Step 4: Simplify right side
    859.37x = 437,190.59
  5. Step 5: Solve for x
    x = 437,190.59/859.37
  6. Step 6: Final answer
    x = 508.74

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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.