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Finding the Fourth Proportional to 930.76, 1,396.80 and 443.80

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Solution

The fourth proportional to 930.76, 1,396.80 and 443.80 is: 666.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.76 : 1,396.80 = 443.80 : x
  2. Step 2: Convert to fraction form
    930.76/1,396.80 = 443.80/x
  3. Step 3: Cross multiply
    930.76x = 1,396.80 × 443.80
  4. Step 4: Simplify right side
    930.76x = 619,899.84
  5. Step 5: Solve for x
    x = 619,899.84/930.76
  6. Step 6: Final answer
    x = 666.01

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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.