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Finding the Fourth Proportional to 1,921.62, 2,877.81 and 1,907.81

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Solution

The fourth proportional to 1,921.62, 2,877.81 and 1,907.81 is: 2,857.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.62 : 2,877.81 = 1,907.81 : x
  2. Step 2: Convert to fraction form
    1,921.62/2,877.81 = 1,907.81/x
  3. Step 3: Cross multiply
    1,921.62x = 2,877.81 × 1,907.81
  4. Step 4: Simplify right side
    1,921.62x = 5,490,300.31
  5. Step 5: Solve for x
    x = 5,490,300.31/1,921.62
  6. Step 6: Final answer
    x = 2,857.12

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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.