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Finding the Fourth Proportional to 28,107.60, 42,163.80 and 9,639.60

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Solution

The fourth proportional to 28,107.60, 42,163.80 and 9,639.60 is: 14,460.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,107.60 : 42,163.80 = 9,639.60 : x
  2. Step 2: Convert to fraction form
    28,107.60/42,163.80 = 9,639.60/x
  3. Step 3: Cross multiply
    28,107.60x = 42,163.80 × 9,639.60
  4. Step 4: Simplify right side
    28,107.60x = 406,442,166.48
  5. Step 5: Solve for x
    x = 406,442,166.48/28,107.60
  6. Step 6: Final answer
    x = 14,460.22

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1.5x scale

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.