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Finding the Fourth Proportional to 2,170.80, 2,995.10 and 1,384.20

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Solution

The fourth proportional to 2,170.80, 2,995.10 and 1,384.20 is: 1,909.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,170.80 : 2,995.10 = 1,384.20 : x
  2. Step 2: Convert to fraction form
    2,170.80/2,995.10 = 1,384.20/x
  3. Step 3: Cross multiply
    2,170.80x = 2,995.10 × 1,384.20
  4. Step 4: Simplify right side
    2,170.80x = 4,145,817.42
  5. Step 5: Solve for x
    x = 4,145,817.42/2,170.80
  6. Step 6: Final answer
    x = 1,909.81

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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.