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Finding the Fourth Proportional to 28,760.80, 43,138.32 and 9,038.80

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Solution

The fourth proportional to 28,760.80, 43,138.32 and 9,038.80 is: 13,557.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,760.80 : 43,138.32 = 9,038.80 : x
  2. Step 2: Convert to fraction form
    28,760.80/43,138.32 = 9,038.80/x
  3. Step 3: Cross multiply
    28,760.80x = 43,138.32 × 9,038.80
  4. Step 4: Simplify right side
    28,760.80x = 389,918,646.82
  5. Step 5: Solve for x
    x = 389,918,646.82/28,760.80
  6. Step 6: Final answer
    x = 13,557.29

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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.