Home / 1,357.90-2,039.56-811.15

Finding the Fourth Proportional to 1,357.90, 2,039.56 and 811.15

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Solution

The fourth proportional to 1,357.90, 2,039.56 and 811.15 is: 1,218.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.90 : 2,039.56 = 811.15 : x
  2. Step 2: Convert to fraction form
    1,357.90/2,039.56 = 811.15/x
  3. Step 3: Cross multiply
    1,357.90x = 2,039.56 × 811.15
  4. Step 4: Simplify right side
    1,357.90x = 1,654,381.97
  5. Step 5: Solve for x
    x = 1,654,381.97/1,357.90
  6. Step 6: Final answer
    x = 1,218.34

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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.