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Finding the Fourth Proportional to 1,447.80, 2,171.52 and 421.80

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Solution

The fourth proportional to 1,447.80, 2,171.52 and 421.80 is: 632.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,447.80 : 2,171.52 = 421.80 : x
  2. Step 2: Convert to fraction form
    1,447.80/2,171.52 = 421.80/x
  3. Step 3: Cross multiply
    1,447.80x = 2,171.52 × 421.80
  4. Step 4: Simplify right side
    1,447.80x = 915,947.14
  5. Step 5: Solve for x
    x = 915,947.14/1,447.80
  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.