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Finding the Fourth Proportional to 1,370.13, 1,889.67 and 872.61

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Solution

The fourth proportional to 1,370.13, 1,889.67 and 872.61 is: 1,203.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.13 : 1,889.67 = 872.61 : x
  2. Step 2: Convert to fraction form
    1,370.13/1,889.67 = 872.61/x
  3. Step 3: Cross multiply
    1,370.13x = 1,889.67 × 872.61
  4. Step 4: Simplify right side
    1,370.13x = 1,648,944.94
  5. Step 5: Solve for x
    x = 1,648,944.94/1,370.13
  6. Step 6: Final answer
    x = 1,203.50

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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.