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Finding the Fourth Proportional to 928.81, 1,392.96 and 279.55

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Solution

The fourth proportional to 928.81, 1,392.96 and 279.55 is: 419.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.81 : 1,392.96 = 279.55 : x
  2. Step 2: Convert to fraction form
    928.81/1,392.96 = 279.55/x
  3. Step 3: Cross multiply
    928.81x = 1,392.96 × 279.55
  4. Step 4: Simplify right side
    928.81x = 389,401.97
  5. Step 5: Solve for x
    x = 389,401.97/928.81
  6. Step 6: Final answer
    x = 419.25

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