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Finding the Fourth Proportional to 482.45, 665.76 and 261.40

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Solution

The fourth proportional to 482.45, 665.76 and 261.40 is: 360.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.45 : 665.76 = 261.40 : x
  2. Step 2: Convert to fraction form
    482.45/665.76 = 261.40/x
  3. Step 3: Cross multiply
    482.45x = 665.76 × 261.40
  4. Step 4: Simplify right side
    482.45x = 174,027.70
  5. Step 5: Solve for x
    x = 174,027.70/482.45
  6. Step 6: Final answer
    x = 360.72

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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.