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Finding the Fourth Proportional to 1,206, 1,809.18 and 426.21

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Solution

The fourth proportional to 1,206, 1,809.18 and 426.21 is: 639.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206 : 1,809.18 = 426.21 : x
  2. Step 2: Convert to fraction form
    1,206/1,809.18 = 426.21/x
  3. Step 3: Cross multiply
    1,206x = 1,809.18 × 426.21
  4. Step 4: Simplify right side
    1,206x = 771,090.61
  5. Step 5: Solve for x
    x = 771,090.61/1,206
  6. Step 6: Final answer
    x = 639.38

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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.