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Finding the Fourth Proportional to 380.40, 524.74 and 281.99

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Solution

The fourth proportional to 380.40, 524.74 and 281.99 is: 388.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.40 : 524.74 = 281.99 : x
  2. Step 2: Convert to fraction form
    380.40/524.74 = 281.99/x
  3. Step 3: Cross multiply
    380.40x = 524.74 × 281.99
  4. Step 4: Simplify right side
    380.40x = 147,971.43
  5. Step 5: Solve for x
    x = 147,971.43/380.40
  6. Step 6: Final answer
    x = 388.99

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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.