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Finding the Fourth Proportional to 381.51, 526.80 and 283.70

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Solution

The fourth proportional to 381.51, 526.80 and 283.70 is: 391.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.51 : 526.80 = 283.70 : x
  2. Step 2: Convert to fraction form
    381.51/526.80 = 283.70/x
  3. Step 3: Cross multiply
    381.51x = 526.80 × 283.70
  4. Step 4: Simplify right side
    381.51x = 149,455.54
  5. Step 5: Solve for x
    x = 149,455.54/381.51
  6. Step 6: Final answer
    x = 391.75

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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.