Home / 1,390.35-2,090.34-1,118.33

Finding the Fourth Proportional to 1,390.35, 2,090.34 and 1,118.33

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Solution

The fourth proportional to 1,390.35, 2,090.34 and 1,118.33 is: 1,681.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.35 : 2,090.34 = 1,118.33 : x
  2. Step 2: Convert to fraction form
    1,390.35/2,090.34 = 1,118.33/x
  3. Step 3: Cross multiply
    1,390.35x = 2,090.34 × 1,118.33
  4. Step 4: Simplify right side
    1,390.35x = 2,337,679.48
  5. Step 5: Solve for x
    x = 2,337,679.48/1,390.35
  6. Step 6: Final answer
    x = 1,681.36

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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.