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Finding the Fourth Proportional to 482.40, 665.74 and 285.90

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Solution

The fourth proportional to 482.40, 665.74 and 285.90 is: 394.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.40 : 665.74 = 285.90 : x
  2. Step 2: Convert to fraction form
    482.40/665.74 = 285.90/x
  3. Step 3: Cross multiply
    482.40x = 665.74 × 285.90
  4. Step 4: Simplify right side
    482.40x = 190,335.07
  5. Step 5: Solve for x
    x = 190,335.07/482.40
  6. Step 6: Final answer
    x = 394.56

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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.