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Finding the Fourth Proportional to 28,496.80, 42,668.40 and 20,663.20

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Solution

The fourth proportional to 28,496.80, 42,668.40 and 20,663.20 is: 30,939.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,496.80 : 42,668.40 = 20,663.20 : x
  2. Step 2: Convert to fraction form
    28,496.80/42,668.40 = 20,663.20/x
  3. Step 3: Cross multiply
    28,496.80x = 42,668.40 × 20,663.20
  4. Step 4: Simplify right side
    28,496.80x = 881,665,682.88
  5. Step 5: Solve for x
    x = 881,665,682.88/28,496.80
  6. Step 6: Final answer
    x = 30,939.11

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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.