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Finding the Fourth Proportional to 386.76, 579.23 and 278.63

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Solution

The fourth proportional to 386.76, 579.23 and 278.63 is: 417.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.76 : 579.23 = 278.63 : x
  2. Step 2: Convert to fraction form
    386.76/579.23 = 278.63/x
  3. Step 3: Cross multiply
    386.76x = 579.23 × 278.63
  4. Step 4: Simplify right side
    386.76x = 161,390.85
  5. Step 5: Solve for x
    x = 161,390.85/386.76
  6. Step 6: Final answer
    x = 417.29

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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.