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Finding the Fourth Proportional to 388.44, 581.22 and 278.76

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Solution

The fourth proportional to 388.44, 581.22 and 278.76 is: 417.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.44 : 581.22 = 278.76 : x
  2. Step 2: Convert to fraction form
    388.44/581.22 = 278.76/x
  3. Step 3: Cross multiply
    388.44x = 581.22 × 278.76
  4. Step 4: Simplify right side
    388.44x = 162,020.89
  5. Step 5: Solve for x
    x = 162,020.89/388.44
  6. Step 6: Final answer
    x = 417.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.