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Finding the Fourth Proportional to 1,013.45, 1,399.41 and 804.80

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Solution

The fourth proportional to 1,013.45, 1,399.41 and 804.80 is: 1,111.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.45 : 1,399.41 = 804.80 : x
  2. Step 2: Convert to fraction form
    1,013.45/1,399.41 = 804.80/x
  3. Step 3: Cross multiply
    1,013.45x = 1,399.41 × 804.80
  4. Step 4: Simplify right side
    1,013.45x = 1,126,248.67
  5. Step 5: Solve for x
    x = 1,126,248.67/1,013.45
  6. Step 6: Final answer
    x = 1,111.31

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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.