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Finding the Fourth Proportional to 390.93, 540.14 and 308.67

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Solution

The fourth proportional to 390.93, 540.14 and 308.67 is: 426.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.93 : 540.14 = 308.67 : x
  2. Step 2: Convert to fraction form
    390.93/540.14 = 308.67/x
  3. Step 3: Cross multiply
    390.93x = 540.14 × 308.67
  4. Step 4: Simplify right side
    390.93x = 166,725.01
  5. Step 5: Solve for x
    x = 166,725.01/390.93
  6. Step 6: Final answer
    x = 426.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.