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Finding the Fourth Proportional to 1,201.04, 1,801.64 and 421.14

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Solution

The fourth proportional to 1,201.04, 1,801.64 and 421.14 is: 631.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.04 : 1,801.64 = 421.14 : x
  2. Step 2: Convert to fraction form
    1,201.04/1,801.64 = 421.14/x
  3. Step 3: Cross multiply
    1,201.04x = 1,801.64 × 421.14
  4. Step 4: Simplify right side
    1,201.04x = 758,742.67
  5. Step 5: Solve for x
    x = 758,742.67/1,201.04
  6. Step 6: Final answer
    x = 631.74

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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.