Home / 1,680.40-2,318.04-1,214.80

Finding the Fourth Proportional to 1,680.40, 2,318.04 and 1,214.80

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Solution

The fourth proportional to 1,680.40, 2,318.04 and 1,214.80 is: 1,675.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.40 : 2,318.04 = 1,214.80 : x
  2. Step 2: Convert to fraction form
    1,680.40/2,318.04 = 1,214.80/x
  3. Step 3: Cross multiply
    1,680.40x = 2,318.04 × 1,214.80
  4. Step 4: Simplify right side
    1,680.40x = 2,815,954.99
  5. Step 5: Solve for x
    x = 2,815,954.99/1,680.40
  6. Step 6: Final answer
    x = 1,675.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.