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Finding the Fourth Proportional to 1,270.04, 1,751.83 and 989.78

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Solution

The fourth proportional to 1,270.04, 1,751.83 and 989.78 is: 1,365.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.04 : 1,751.83 = 989.78 : x
  2. Step 2: Convert to fraction form
    1,270.04/1,751.83 = 989.78/x
  3. Step 3: Cross multiply
    1,270.04x = 1,751.83 × 989.78
  4. Step 4: Simplify right side
    1,270.04x = 1,733,915.06
  5. Step 5: Solve for x
    x = 1,733,915.06/1,270.04
  6. Step 6: Final answer
    x = 1,365.25

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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.