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Finding the Fourth Proportional to 13,655.25, 20,488.05 and 4,421.25

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Solution

The fourth proportional to 13,655.25, 20,488.05 and 4,421.25 is: 6,633.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,655.25 : 20,488.05 = 4,421.25 : x
  2. Step 2: Convert to fraction form
    13,655.25/20,488.05 = 4,421.25/x
  3. Step 3: Cross multiply
    13,655.25x = 20,488.05 × 4,421.25
  4. Step 4: Simplify right side
    13,655.25x = 90,582,791.06
  5. Step 5: Solve for x
    x = 90,582,791.06/13,655.25
  6. Step 6: Final answer
    x = 6,633.55

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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.