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Finding the Fourth Proportional to 1,868, 2,576.64 and 1,237.60

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Solution

The fourth proportional to 1,868, 2,576.64 and 1,237.60 is: 1,707.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,868 : 2,576.64 = 1,237.60 : x
  2. Step 2: Convert to fraction form
    1,868/2,576.64 = 1,237.60/x
  3. Step 3: Cross multiply
    1,868x = 2,576.64 × 1,237.60
  4. Step 4: Simplify right side
    1,868x = 3,188,849.66
  5. Step 5: Solve for x
    x = 3,188,849.66/1,868
  6. Step 6: Final answer
    x = 1,707.09

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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.