Home / 1,985.90-2,976.42-1,118.40

Finding the Fourth Proportional to 1,985.90, 2,976.42 and 1,118.40

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Solution

The fourth proportional to 1,985.90, 2,976.42 and 1,118.40 is: 1,676.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.90 : 2,976.42 = 1,118.40 : x
  2. Step 2: Convert to fraction form
    1,985.90/2,976.42 = 1,118.40/x
  3. Step 3: Cross multiply
    1,985.90x = 2,976.42 × 1,118.40
  4. Step 4: Simplify right side
    1,985.90x = 3,328,828.13
  5. Step 5: Solve for x
    x = 3,328,828.13/1,985.90
  6. Step 6: Final answer
    x = 1,676.23

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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.