Home / 2,085.18-3,127.70-698.40

Finding the Fourth Proportional to 2,085.18, 3,127.70 and 698.40

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Solution

The fourth proportional to 2,085.18, 3,127.70 and 698.40 is: 1,047.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.18 : 3,127.70 = 698.40 : x
  2. Step 2: Convert to fraction form
    2,085.18/3,127.70 = 698.40/x
  3. Step 3: Cross multiply
    2,085.18x = 3,127.70 × 698.40
  4. Step 4: Simplify right side
    2,085.18x = 2,184,385.68
  5. Step 5: Solve for x
    x = 2,184,385.68/2,085.18
  6. Step 6: Final answer
    x = 1,047.58

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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.