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Finding the Fourth Proportional to 859.21, 1,289.24 and 426.13

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Solution

The fourth proportional to 859.21, 1,289.24 and 426.13 is: 639.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.21 : 1,289.24 = 426.13 : x
  2. Step 2: Convert to fraction form
    859.21/1,289.24 = 426.13/x
  3. Step 3: Cross multiply
    859.21x = 1,289.24 × 426.13
  4. Step 4: Simplify right side
    859.21x = 549,383.84
  5. Step 5: Solve for x
    x = 549,383.84/859.21
  6. Step 6: Final answer
    x = 639.41

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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.