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Finding the Fourth Proportional to 14,005.80, 20,992.05 and 7,428.60

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Solution

The fourth proportional to 14,005.80, 20,992.05 and 7,428.60 is: 11,134.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,005.80 : 20,992.05 = 7,428.60 : x
  2. Step 2: Convert to fraction form
    14,005.80/20,992.05 = 7,428.60/x
  3. Step 3: Cross multiply
    14,005.80x = 20,992.05 × 7,428.60
  4. Step 4: Simplify right side
    14,005.80x = 155,941,542.63
  5. Step 5: Solve for x
    x = 155,941,542.63/14,005.80
  6. Step 6: Final answer
    x = 11,134.07

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1.5x scale

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.