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Finding the Fourth Proportional to 482.20, 665.70 and 307.48

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Solution

The fourth proportional to 482.20, 665.70 and 307.48 is: 424.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.20 : 665.70 = 307.48 : x
  2. Step 2: Convert to fraction form
    482.20/665.70 = 307.48/x
  3. Step 3: Cross multiply
    482.20x = 665.70 × 307.48
  4. Step 4: Simplify right side
    482.20x = 204,689.44
  5. Step 5: Solve for x
    x = 204,689.44/482.20
  6. Step 6: Final answer
    x = 424.49

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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.