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Finding the Fourth Proportional to 28,281.70, 42,421.20 and 9,559.90

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Solution

The fourth proportional to 28,281.70, 42,421.20 and 9,559.90 is: 14,339.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,281.70 : 42,421.20 = 9,559.90 : x
  2. Step 2: Convert to fraction form
    28,281.70/42,421.20 = 9,559.90/x
  3. Step 3: Cross multiply
    28,281.70x = 42,421.20 × 9,559.90
  4. Step 4: Simplify right side
    28,281.70x = 405,542,429.88
  5. Step 5: Solve for x
    x = 405,542,429.88/28,281.70
  6. Step 6: Final answer
    x = 14,339.39

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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.