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Finding the Fourth Proportional to 2,157.80, 2,977.80 and 1,213.80

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Solution

The fourth proportional to 2,157.80, 2,977.80 and 1,213.80 is: 1,675.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.80 : 2,977.80 = 1,213.80 : x
  2. Step 2: Convert to fraction form
    2,157.80/2,977.80 = 1,213.80/x
  3. Step 3: Cross multiply
    2,157.80x = 2,977.80 × 1,213.80
  4. Step 4: Simplify right side
    2,157.80x = 3,614,453.64
  5. Step 5: Solve for x
    x = 3,614,453.64/2,157.80
  6. Step 6: Final answer
    x = 1,675.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.