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Finding the Fourth Proportional to 1,970.80, 2,956.60 and 930.80

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Solution

The fourth proportional to 1,970.80, 2,956.60 and 930.80 is: 1,396.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,970.80 : 2,956.60 = 930.80 : x
  2. Step 2: Convert to fraction form
    1,970.80/2,956.60 = 930.80/x
  3. Step 3: Cross multiply
    1,970.80x = 2,956.60 × 930.80
  4. Step 4: Simplify right side
    1,970.80x = 2,752,003.28
  5. Step 5: Solve for x
    x = 2,752,003.28/1,970.80
  6. Step 6: Final answer
    x = 1,396.39

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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.