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Finding the Fourth Proportional to 1,202.09, 1,803.06 and 421.79

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Solution

The fourth proportional to 1,202.09, 1,803.06 and 421.79 is: 632.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,202.09 : 1,803.06 = 421.79 : x
  2. Step 2: Convert to fraction form
    1,202.09/1,803.06 = 421.79/x
  3. Step 3: Cross multiply
    1,202.09x = 1,803.06 × 421.79
  4. Step 4: Simplify right side
    1,202.09x = 760,503.66
  5. Step 5: Solve for x
    x = 760,503.66/1,202.09
  6. Step 6: Final answer
    x = 632.65

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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.