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Finding the Fourth Proportional to 307.45, 424.33 and 189.45

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Solution

The fourth proportional to 307.45, 424.33 and 189.45 is: 261.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.45 : 424.33 = 189.45 : x
  2. Step 2: Convert to fraction form
    307.45/424.33 = 189.45/x
  3. Step 3: Cross multiply
    307.45x = 424.33 × 189.45
  4. Step 4: Simplify right side
    307.45x = 80,386.25
  5. Step 5: Solve for x
    x = 80,386.25/307.45
  6. Step 6: Final answer
    x = 261.46

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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.