Home / 1,511.21-2,085.39-1,013.78

Finding the Fourth Proportional to 1,511.21, 2,085.39 and 1,013.78

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Solution

The fourth proportional to 1,511.21, 2,085.39 and 1,013.78 is: 1,398.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.21 : 2,085.39 = 1,013.78 : x
  2. Step 2: Convert to fraction form
    1,511.21/2,085.39 = 1,013.78/x
  3. Step 3: Cross multiply
    1,511.21x = 2,085.39 × 1,013.78
  4. Step 4: Simplify right side
    1,511.21x = 2,114,126.67
  5. Step 5: Solve for x
    x = 2,114,126.67/1,511.21
  6. Step 6: Final answer
    x = 1,398.96

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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.