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Finding the Fourth Proportional to 20,990.73, 28,968.42 and 12,038.16

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Solution

The fourth proportional to 20,990.73, 28,968.42 and 12,038.16 is: 16,613.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.73 : 28,968.42 = 12,038.16 : x
  2. Step 2: Convert to fraction form
    20,990.73/28,968.42 = 12,038.16/x
  3. Step 3: Cross multiply
    20,990.73x = 28,968.42 × 12,038.16
  4. Step 4: Simplify right side
    20,990.73x = 348,726,474.91
  5. Step 5: Solve for x
    x = 348,726,474.91/20,990.73
  6. Step 6: Final answer
    x = 16,613.36

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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.