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Finding the Fourth Proportional to 20,998.34, 28,978.05 and 11,566.91

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Solution

The fourth proportional to 20,998.34, 28,978.05 and 11,566.91 is: 15,962.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,998.34 : 28,978.05 = 11,566.91 : x
  2. Step 2: Convert to fraction form
    20,998.34/28,978.05 = 11,566.91/x
  3. Step 3: Cross multiply
    20,998.34x = 28,978.05 × 11,566.91
  4. Step 4: Simplify right side
    20,998.34x = 335,186,351.44
  5. Step 5: Solve for x
    x = 335,186,351.44/20,998.34
  6. Step 6: Final answer
    x = 15,962.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.