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Finding the Fourth Proportional to 1,231.09, 1,698.90 and 671.55

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Solution

The fourth proportional to 1,231.09, 1,698.90 and 671.55 is: 926.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.09 : 1,698.90 = 671.55 : x
  2. Step 2: Convert to fraction form
    1,231.09/1,698.90 = 671.55/x
  3. Step 3: Cross multiply
    1,231.09x = 1,698.90 × 671.55
  4. Step 4: Simplify right side
    1,231.09x = 1,140,900.37
  5. Step 5: Solve for x
    x = 1,140,900.37/1,231.09
  6. Step 6: Final answer
    x = 926.74

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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.