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Finding the Fourth Proportional to 1,313.57, 1,971.37 and 980.85

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Solution

The fourth proportional to 1,313.57, 1,971.37 and 980.85 is: 1,472.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.57 : 1,971.37 = 980.85 : x
  2. Step 2: Convert to fraction form
    1,313.57/1,971.37 = 980.85/x
  3. Step 3: Cross multiply
    1,313.57x = 1,971.37 × 980.85
  4. Step 4: Simplify right side
    1,313.57x = 1,933,613.97
  5. Step 5: Solve for x
    x = 1,933,613.97/1,313.57
  6. Step 6: Final answer
    x = 1,472.03

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1.5x scale

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.