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Finding the Fourth Proportional to 380.76, 525.42 and 276

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Solution

The fourth proportional to 380.76, 525.42 and 276 is: 380.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.76 : 525.42 = 276 : x
  2. Step 2: Convert to fraction form
    380.76/525.42 = 276/x
  3. Step 3: Cross multiply
    380.76x = 525.42 × 276
  4. Step 4: Simplify right side
    380.76x = 145,015.92
  5. Step 5: Solve for x
    x = 145,015.92/380.76
  6. Step 6: Final answer
    x = 380.86

Related Problems

Find fourth proportional to 190.38, 262.71 and 138
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1.5x scale

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.