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Finding the Fourth Proportional to 680.08, 1,019.44 and 390.92

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Solution

The fourth proportional to 680.08, 1,019.44 and 390.92 is: 585.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.08 : 1,019.44 = 390.92 : x
  2. Step 2: Convert to fraction form
    680.08/1,019.44 = 390.92/x
  3. Step 3: Cross multiply
    680.08x = 1,019.44 × 390.92
  4. Step 4: Simplify right side
    680.08x = 398,519.48
  5. Step 5: Solve for x
    x = 398,519.48/680.08
  6. Step 6: Final answer
    x = 585.99

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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.