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Finding the Fourth Proportional to 20,407.98, 28,162.98 and 11,455.49

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Solution

The fourth proportional to 20,407.98, 28,162.98 and 11,455.49 is: 15,808.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,407.98 : 28,162.98 = 11,455.49 : x
  2. Step 2: Convert to fraction form
    20,407.98/28,162.98 = 11,455.49/x
  3. Step 3: Cross multiply
    20,407.98x = 28,162.98 × 11,455.49
  4. Step 4: Simplify right side
    20,407.98x = 322,620,735.76
  5. Step 5: Solve for x
    x = 322,620,735.76/20,407.98
  6. Step 6: Final answer
    x = 15,808.56

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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.