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Finding the Fourth Proportional to 28,659.90, 42,989.85 and 8,940.09

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Solution

The fourth proportional to 28,659.90, 42,989.85 and 8,940.09 is: 13,410.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,659.90 : 42,989.85 = 8,940.09 : x
  2. Step 2: Convert to fraction form
    28,659.90/42,989.85 = 8,940.09/x
  3. Step 3: Cross multiply
    28,659.90x = 42,989.85 × 8,940.09
  4. Step 4: Simplify right side
    28,659.90x = 384,333,128.09
  5. Step 5: Solve for x
    x = 384,333,128.09/28,659.90
  6. Step 6: Final answer
    x = 13,410.14

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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.