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Finding the Fourth Proportional to 1,620.59, 2,431.96 and 851.63

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Solution

The fourth proportional to 1,620.59, 2,431.96 and 851.63 is: 1,278.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.59 : 2,431.96 = 851.63 : x
  2. Step 2: Convert to fraction form
    1,620.59/2,431.96 = 851.63/x
  3. Step 3: Cross multiply
    1,620.59x = 2,431.96 × 851.63
  4. Step 4: Simplify right side
    1,620.59x = 2,071,115.81
  5. Step 5: Solve for x
    x = 2,071,115.81/1,620.59
  6. Step 6: Final answer
    x = 1,278.01

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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.