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Finding the Fourth Proportional to 859.73, 1,289.40 and 339.75

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Solution

The fourth proportional to 859.73, 1,289.40 and 339.75 is: 509.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.73 : 1,289.40 = 339.75 : x
  2. Step 2: Convert to fraction form
    859.73/1,289.40 = 339.75/x
  3. Step 3: Cross multiply
    859.73x = 1,289.40 × 339.75
  4. Step 4: Simplify right side
    859.73x = 438,073.65
  5. Step 5: Solve for x
    x = 438,073.65/859.73
  6. Step 6: Final answer
    x = 509.55

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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.