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Finding the Fourth Proportional to 20,605.44, 28,440 and 12,651.84

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Solution

The fourth proportional to 20,605.44, 28,440 and 12,651.84 is: 17,462.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,605.44 : 28,440 = 12,651.84 : x
  2. Step 2: Convert to fraction form
    20,605.44/28,440 = 12,651.84/x
  3. Step 3: Cross multiply
    20,605.44x = 28,440 × 12,651.84
  4. Step 4: Simplify right side
    20,605.44x = 359,818,329.60
  5. Step 5: Solve for x
    x = 359,818,329.60/20,605.44
  6. Step 6: Final answer
    x = 17,462.30

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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.