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Finding the Fourth Proportional to 482.48, 665.76 and 286

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Solution

The fourth proportional to 482.48, 665.76 and 286 is: 394.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.48 : 665.76 = 286 : x
  2. Step 2: Convert to fraction form
    482.48/665.76 = 286/x
  3. Step 3: Cross multiply
    482.48x = 665.76 × 286
  4. Step 4: Simplify right side
    482.48x = 190,407.36
  5. Step 5: Solve for x
    x = 190,407.36/482.48
  6. Step 6: Final answer
    x = 394.64

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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.