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Finding the Fourth Proportional to 1,912.93, 2,866.74 and 870.39

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Solution

The fourth proportional to 1,912.93, 2,866.74 and 870.39 is: 1,304.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.93 : 2,866.74 = 870.39 : x
  2. Step 2: Convert to fraction form
    1,912.93/2,866.74 = 870.39/x
  3. Step 3: Cross multiply
    1,912.93x = 2,866.74 × 870.39
  4. Step 4: Simplify right side
    1,912.93x = 2,495,181.83
  5. Step 5: Solve for x
    x = 2,495,181.83/1,912.93
  6. Step 6: Final answer
    x = 1,304.38

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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.