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Finding the Fourth Proportional to 1,783.91, 2,676 and 485.39

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Solution

The fourth proportional to 1,783.91, 2,676 and 485.39 is: 728.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,783.91 : 2,676 = 485.39 : x
  2. Step 2: Convert to fraction form
    1,783.91/2,676 = 485.39/x
  3. Step 3: Cross multiply
    1,783.91x = 2,676 × 485.39
  4. Step 4: Simplify right side
    1,783.91x = 1,298,903.64
  5. Step 5: Solve for x
    x = 1,298,903.64/1,783.91
  6. Step 6: Final answer
    x = 728.12

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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.