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Finding the Fourth Proportional to 307.56, 424.58 and 189.56

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Solution

The fourth proportional to 307.56, 424.58 and 189.56 is: 261.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.56 : 424.58 = 189.56 : x
  2. Step 2: Convert to fraction form
    307.56/424.58 = 189.56/x
  3. Step 3: Cross multiply
    307.56x = 424.58 × 189.56
  4. Step 4: Simplify right side
    307.56x = 80,480.31
  5. Step 5: Solve for x
    x = 80,480.31/307.56
  6. Step 6: Final answer
    x = 261.67

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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.