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Finding the Fourth Proportional to 1,991.70, 2,988.45 and 951.30

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Solution

The fourth proportional to 1,991.70, 2,988.45 and 951.30 is: 1,427.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.70 : 2,988.45 = 951.30 : x
  2. Step 2: Convert to fraction form
    1,991.70/2,988.45 = 951.30/x
  3. Step 3: Cross multiply
    1,991.70x = 2,988.45 × 951.30
  4. Step 4: Simplify right side
    1,991.70x = 2,842,912.49
  5. Step 5: Solve for x
    x = 2,842,912.49/1,991.70
  6. Step 6: Final answer
    x = 1,427.38

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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.