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Finding the Fourth Proportional to 2,928.36, 4,393.16 and 980.76

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Solution

The fourth proportional to 2,928.36, 4,393.16 and 980.76 is: 1,471.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,928.36 : 4,393.16 = 980.76 : x
  2. Step 2: Convert to fraction form
    2,928.36/4,393.16 = 980.76/x
  3. Step 3: Cross multiply
    2,928.36x = 4,393.16 × 980.76
  4. Step 4: Simplify right side
    2,928.36x = 4,308,635.60
  5. Step 5: Solve for x
    x = 4,308,635.60/2,928.36
  6. Step 6: Final answer
    x = 1,471.35

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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.