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Finding the Fourth Proportional to 718.77, 1,078.08 and 280.34

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Solution

The fourth proportional to 718.77, 1,078.08 and 280.34 is: 420.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.77 : 1,078.08 = 280.34 : x
  2. Step 2: Convert to fraction form
    718.77/1,078.08 = 280.34/x
  3. Step 3: Cross multiply
    718.77x = 1,078.08 × 280.34
  4. Step 4: Simplify right side
    718.77x = 302,223.56
  5. Step 5: Solve for x
    x = 302,223.56/718.77
  6. Step 6: Final answer
    x = 420.47

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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.