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Finding the Fourth Proportional to 1,331.40, 1,997.19 and 638.37

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Solution

The fourth proportional to 1,331.40, 1,997.19 and 638.37 is: 957.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.40 : 1,997.19 = 638.37 : x
  2. Step 2: Convert to fraction form
    1,331.40/1,997.19 = 638.37/x
  3. Step 3: Cross multiply
    1,331.40x = 1,997.19 × 638.37
  4. Step 4: Simplify right side
    1,331.40x = 1,274,946.18
  5. Step 5: Solve for x
    x = 1,274,946.18/1,331.40
  6. Step 6: Final answer
    x = 957.60

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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.