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Finding the Fourth Proportional to 386.87, 579.92 and 316.76

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Solution

The fourth proportional to 386.87, 579.92 and 316.76 is: 474.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.87 : 579.92 = 316.76 : x
  2. Step 2: Convert to fraction form
    386.87/579.92 = 316.76/x
  3. Step 3: Cross multiply
    386.87x = 579.92 × 316.76
  4. Step 4: Simplify right side
    386.87x = 183,690.98
  5. Step 5: Solve for x
    x = 183,690.98/386.87
  6. Step 6: Final answer
    x = 474.82

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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.