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Finding the Fourth Proportional to 1,780.14, 2,670.04 and 684.20

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Solution

The fourth proportional to 1,780.14, 2,670.04 and 684.20 is: 1,026.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.14 : 2,670.04 = 684.20 : x
  2. Step 2: Convert to fraction form
    1,780.14/2,670.04 = 684.20/x
  3. Step 3: Cross multiply
    1,780.14x = 2,670.04 × 684.20
  4. Step 4: Simplify right side
    1,780.14x = 1,826,841.37
  5. Step 5: Solve for x
    x = 1,826,841.37/1,780.14
  6. Step 6: Final answer
    x = 1,026.23

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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.