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Finding the Fourth Proportional to 1,999.40, 2,758.64 and 1,115

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Solution

The fourth proportional to 1,999.40, 2,758.64 and 1,115 is: 1,538.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.40 : 2,758.64 = 1,115 : x
  2. Step 2: Convert to fraction form
    1,999.40/2,758.64 = 1,115/x
  3. Step 3: Cross multiply
    1,999.40x = 2,758.64 × 1,115
  4. Step 4: Simplify right side
    1,999.40x = 3,075,883.60
  5. Step 5: Solve for x
    x = 3,075,883.60/1,999.40
  6. Step 6: Final answer
    x = 1,538.40

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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.