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Finding the Fourth Proportional to 1,890.61, 2,823.99 and 1,856

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Solution

The fourth proportional to 1,890.61, 2,823.99 and 1,856 is: 2,772.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.61 : 2,823.99 = 1,856 : x
  2. Step 2: Convert to fraction form
    1,890.61/2,823.99 = 1,856/x
  3. Step 3: Cross multiply
    1,890.61x = 2,823.99 × 1,856
  4. Step 4: Simplify right side
    1,890.61x = 5,241,325.44
  5. Step 5: Solve for x
    x = 5,241,325.44/1,890.61
  6. Step 6: Final answer
    x = 2,772.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.