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Finding the Fourth Proportional to 1,886.99, 2,603.33 and 1,390.81

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Solution

The fourth proportional to 1,886.99, 2,603.33 and 1,390.81 is: 1,918.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,886.99 : 2,603.33 = 1,390.81 : x
  2. Step 2: Convert to fraction form
    1,886.99/2,603.33 = 1,390.81/x
  3. Step 3: Cross multiply
    1,886.99x = 2,603.33 × 1,390.81
  4. Step 4: Simplify right side
    1,886.99x = 3,620,730.44
  5. Step 5: Solve for x
    x = 3,620,730.44/1,886.99
  6. Step 6: Final answer
    x = 1,918.79

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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.