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Finding the Fourth Proportional to 1,243.36, 1,864.56 and 421.48

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Solution

The fourth proportional to 1,243.36, 1,864.56 and 421.48 is: 632.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.36 : 1,864.56 = 421.48 : x
  2. Step 2: Convert to fraction form
    1,243.36/1,864.56 = 421.48/x
  3. Step 3: Cross multiply
    1,243.36x = 1,864.56 × 421.48
  4. Step 4: Simplify right side
    1,243.36x = 785,874.75
  5. Step 5: Solve for x
    x = 785,874.75/1,243.36
  6. Step 6: Final answer
    x = 632.06

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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.