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Finding the Fourth Proportional to 1,556.80, 2,336.96 and 980

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Solution

The fourth proportional to 1,556.80, 2,336.96 and 980 is: 1,471.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,556.80 : 2,336.96 = 980 : x
  2. Step 2: Convert to fraction form
    1,556.80/2,336.96 = 980/x
  3. Step 3: Cross multiply
    1,556.80x = 2,336.96 × 980
  4. Step 4: Simplify right side
    1,556.80x = 2,290,220.80
  5. Step 5: Solve for x
    x = 2,290,220.80/1,556.80
  6. Step 6: Final answer
    x = 1,471.11

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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.