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Finding the Fourth Proportional to 2,156.70, 2,976.14 and 1,318.80

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Solution

The fourth proportional to 2,156.70, 2,976.14 and 1,318.80 is: 1,819.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.70 : 2,976.14 = 1,318.80 : x
  2. Step 2: Convert to fraction form
    2,156.70/2,976.14 = 1,318.80/x
  3. Step 3: Cross multiply
    2,156.70x = 2,976.14 × 1,318.80
  4. Step 4: Simplify right side
    2,156.70x = 3,924,918.55
  5. Step 5: Solve for x
    x = 3,924,918.55/2,156.70
  6. Step 6: Final answer
    x = 1,819.88

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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.