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Finding the Fourth Proportional to 853.79, 1,280.68 and 367.18

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Solution

The fourth proportional to 853.79, 1,280.68 and 367.18 is: 550.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.79 : 1,280.68 = 367.18 : x
  2. Step 2: Convert to fraction form
    853.79/1,280.68 = 367.18/x
  3. Step 3: Cross multiply
    853.79x = 1,280.68 × 367.18
  4. Step 4: Simplify right side
    853.79x = 470,240.08
  5. Step 5: Solve for x
    x = 470,240.08/853.79
  6. Step 6: Final answer
    x = 550.77

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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.