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Finding the Fourth Proportional to 28,655.70, 42,991.86 and 8,934.48

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Solution

The fourth proportional to 28,655.70, 42,991.86 and 8,934.48 is: 13,404.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,655.70 : 42,991.86 = 8,934.48 : x
  2. Step 2: Convert to fraction form
    28,655.70/42,991.86 = 8,934.48/x
  3. Step 3: Cross multiply
    28,655.70x = 42,991.86 × 8,934.48
  4. Step 4: Simplify right side
    28,655.70x = 384,109,913.33
  5. Step 5: Solve for x
    x = 384,109,913.33/28,655.70
  6. Step 6: Final answer
    x = 13,404.31

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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.