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Finding the Fourth Proportional to 482.47, 665.67 and 285.91

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Solution

The fourth proportional to 482.47, 665.67 and 285.91 is: 394.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.47 : 665.67 = 285.91 : x
  2. Step 2: Convert to fraction form
    482.47/665.67 = 285.91/x
  3. Step 3: Cross multiply
    482.47x = 665.67 × 285.91
  4. Step 4: Simplify right side
    482.47x = 190,321.71
  5. Step 5: Solve for x
    x = 190,321.71/482.47
  6. Step 6: Final answer
    x = 394.47

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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.