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Finding the Fourth Proportional to 859.50, 1,287.18 and 550.40

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Solution

The fourth proportional to 859.50, 1,287.18 and 550.40 is: 824.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.50 : 1,287.18 = 550.40 : x
  2. Step 2: Convert to fraction form
    859.50/1,287.18 = 550.40/x
  3. Step 3: Cross multiply
    859.50x = 1,287.18 × 550.40
  4. Step 4: Simplify right side
    859.50x = 708,457.44
  5. Step 5: Solve for x
    x = 708,457.44/859.50
  6. Step 6: Final answer
    x = 824.27

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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.