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Finding the Fourth Proportional to 1,370.26, 1,890.21 and 872.02

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Solution

The fourth proportional to 1,370.26, 1,890.21 and 872.02 is: 1,202.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.26 : 1,890.21 = 872.02 : x
  2. Step 2: Convert to fraction form
    1,370.26/1,890.21 = 872.02/x
  3. Step 3: Cross multiply
    1,370.26x = 1,890.21 × 872.02
  4. Step 4: Simplify right side
    1,370.26x = 1,648,300.92
  5. Step 5: Solve for x
    x = 1,648,300.92/1,370.26
  6. Step 6: Final answer
    x = 1,202.91

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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.