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Finding the Fourth Proportional to 1,639.06, 2,261.86 and 893

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Solution

The fourth proportional to 1,639.06, 2,261.86 and 893 is: 1,232.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.06 : 2,261.86 = 893 : x
  2. Step 2: Convert to fraction form
    1,639.06/2,261.86 = 893/x
  3. Step 3: Cross multiply
    1,639.06x = 2,261.86 × 893
  4. Step 4: Simplify right side
    1,639.06x = 2,019,840.98
  5. Step 5: Solve for x
    x = 2,019,840.98/1,639.06
  6. Step 6: Final answer
    x = 1,232.32

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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.