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Finding the Fourth Proportional to 20,988.72, 28,978.36 and 13,042.80

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Solution

The fourth proportional to 20,988.72, 28,978.36 and 13,042.80 is: 18,007.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.72 : 28,978.36 = 13,042.80 : x
  2. Step 2: Convert to fraction form
    20,988.72/28,978.36 = 13,042.80/x
  3. Step 3: Cross multiply
    20,988.72x = 28,978.36 × 13,042.80
  4. Step 4: Simplify right side
    20,988.72x = 377,958,953.81
  5. Step 5: Solve for x
    x = 377,958,953.81/20,988.72
  6. Step 6: Final answer
    x = 18,007.72

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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.