Home / 2,603.78-3,905-1,215.80

Finding the Fourth Proportional to 2,603.78, 3,905 and 1,215.80

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Solution

The fourth proportional to 2,603.78, 3,905 and 1,215.80 is: 1,823.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,603.78 : 3,905 = 1,215.80 : x
  2. Step 2: Convert to fraction form
    2,603.78/3,905 = 1,215.80/x
  3. Step 3: Cross multiply
    2,603.78x = 3,905 × 1,215.80
  4. Step 4: Simplify right side
    2,603.78x = 4,747,699
  5. Step 5: Solve for x
    x = 4,747,699/2,603.78
  6. Step 6: Final answer
    x = 1,823.39

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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.