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Finding the Fourth Proportional to 5,159.64, 7,742.81 and 1,872.45

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Solution

The fourth proportional to 5,159.64, 7,742.81 and 1,872.45 is: 2,809.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,159.64 : 7,742.81 = 1,872.45 : x
  2. Step 2: Convert to fraction form
    5,159.64/7,742.81 = 1,872.45/x
  3. Step 3: Cross multiply
    5,159.64x = 7,742.81 × 1,872.45
  4. Step 4: Simplify right side
    5,159.64x = 14,498,015.22
  5. Step 5: Solve for x
    x = 14,498,015.22/5,159.64
  6. Step 6: Final answer
    x = 2,809.89

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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.