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Finding the Fourth Proportional to 307.80, 423.90 and 274.32

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Solution

The fourth proportional to 307.80, 423.90 and 274.32 is: 377.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.80 : 423.90 = 274.32 : x
  2. Step 2: Convert to fraction form
    307.80/423.90 = 274.32/x
  3. Step 3: Cross multiply
    307.80x = 423.90 × 274.32
  4. Step 4: Simplify right side
    307.80x = 116,284.25
  5. Step 5: Solve for x
    x = 116,284.25/307.80
  6. Step 6: Final answer
    x = 377.79

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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.