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Finding the Fourth Proportional to 859.61, 1,289.60 and 274.79

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Solution

The fourth proportional to 859.61, 1,289.60 and 274.79 is: 412.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.61 : 1,289.60 = 274.79 : x
  2. Step 2: Convert to fraction form
    859.61/1,289.60 = 274.79/x
  3. Step 3: Cross multiply
    859.61x = 1,289.60 × 274.79
  4. Step 4: Simplify right side
    859.61x = 354,361.36
  5. Step 5: Solve for x
    x = 354,361.36/859.61
  6. Step 6: Final answer
    x = 412.24

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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.