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Finding the Fourth Proportional to 28,686.60, 43,029.90 and 8,971.20

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Solution

The fourth proportional to 28,686.60, 43,029.90 and 8,971.20 is: 13,456.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,686.60 : 43,029.90 = 8,971.20 : x
  2. Step 2: Convert to fraction form
    28,686.60/43,029.90 = 8,971.20/x
  3. Step 3: Cross multiply
    28,686.60x = 43,029.90 × 8,971.20
  4. Step 4: Simplify right side
    28,686.60x = 386,029,838.88
  5. Step 5: Solve for x
    x = 386,029,838.88/28,686.60
  6. Step 6: Final answer
    x = 13,456.80

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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.