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Finding the Fourth Proportional to 1,420.63, 2,129.57 and 872.97

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Solution

The fourth proportional to 1,420.63, 2,129.57 and 872.97 is: 1,308.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.63 : 2,129.57 = 872.97 : x
  2. Step 2: Convert to fraction form
    1,420.63/2,129.57 = 872.97/x
  3. Step 3: Cross multiply
    1,420.63x = 2,129.57 × 872.97
  4. Step 4: Simplify right side
    1,420.63x = 1,859,050.72
  5. Step 5: Solve for x
    x = 1,859,050.72/1,420.63
  6. Step 6: Final answer
    x = 1,308.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.