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Finding the Fourth Proportional to 1,620.61, 2,236.67 and 912.51

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Solution

The fourth proportional to 1,620.61, 2,236.67 and 912.51 is: 1,259.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.61 : 2,236.67 = 912.51 : x
  2. Step 2: Convert to fraction form
    1,620.61/2,236.67 = 912.51/x
  3. Step 3: Cross multiply
    1,620.61x = 2,236.67 × 912.51
  4. Step 4: Simplify right side
    1,620.61x = 2,040,983.74
  5. Step 5: Solve for x
    x = 2,040,983.74/1,620.61
  6. Step 6: Final answer
    x = 1,259.39

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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.