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Finding the Fourth Proportional to 718.99, 1,078.26 and 280.22

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Solution

The fourth proportional to 718.99, 1,078.26 and 280.22 is: 420.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.99 : 1,078.26 = 280.22 : x
  2. Step 2: Convert to fraction form
    718.99/1,078.26 = 280.22/x
  3. Step 3: Cross multiply
    718.99x = 1,078.26 × 280.22
  4. Step 4: Simplify right side
    718.99x = 302,143.58
  5. Step 5: Solve for x
    x = 302,143.58/718.99
  6. Step 6: Final answer
    x = 420.23

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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.