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Finding the Fourth Proportional to 1,206.30, 1,809.09 and 628.86

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Solution

The fourth proportional to 1,206.30, 1,809.09 and 628.86 is: 943.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.30 : 1,809.09 = 628.86 : x
  2. Step 2: Convert to fraction form
    1,206.30/1,809.09 = 628.86/x
  3. Step 3: Cross multiply
    1,206.30x = 1,809.09 × 628.86
  4. Step 4: Simplify right side
    1,206.30x = 1,137,664.34
  5. Step 5: Solve for x
    x = 1,137,664.34/1,206.30
  6. Step 6: Final answer
    x = 943.10

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1.5x scale

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.