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Finding the Fourth Proportional to 28,325.70, 42,487.20 and 9,603.90

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Solution

The fourth proportional to 28,325.70, 42,487.20 and 9,603.90 is: 14,405.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,325.70 : 42,487.20 = 9,603.90 : x
  2. Step 2: Convert to fraction form
    28,325.70/42,487.20 = 9,603.90/x
  3. Step 3: Cross multiply
    28,325.70x = 42,487.20 × 9,603.90
  4. Step 4: Simplify right side
    28,325.70x = 408,042,820.08
  5. Step 5: Solve for x
    x = 408,042,820.08/28,325.70
  6. Step 6: Final answer
    x = 14,405.39

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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.