Home / 1,388.16-2,085.48-811.44

Finding the Fourth Proportional to 1,388.16, 2,085.48 and 811.44

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Solution

The fourth proportional to 1,388.16, 2,085.48 and 811.44 is: 1,219.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.16 : 2,085.48 = 811.44 : x
  2. Step 2: Convert to fraction form
    1,388.16/2,085.48 = 811.44/x
  3. Step 3: Cross multiply
    1,388.16x = 2,085.48 × 811.44
  4. Step 4: Simplify right side
    1,388.16x = 1,692,241.89
  5. Step 5: Solve for x
    x = 1,692,241.89/1,388.16
  6. Step 6: Final answer
    x = 1,219.05

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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.