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Finding the Fourth Proportional to 443.76, 668.22 and 390.30

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Solution

The fourth proportional to 443.76, 668.22 and 390.30 is: 587.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.76 : 668.22 = 390.30 : x
  2. Step 2: Convert to fraction form
    443.76/668.22 = 390.30/x
  3. Step 3: Cross multiply
    443.76x = 668.22 × 390.30
  4. Step 4: Simplify right side
    443.76x = 260,806.27
  5. Step 5: Solve for x
    x = 260,806.27/443.76
  6. Step 6: Final answer
    x = 587.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.