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Finding the Fourth Proportional to 20,339, 28,066.28 and 12,380.34

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Solution

The fourth proportional to 20,339, 28,066.28 and 12,380.34 is: 17,083.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,339 : 28,066.28 = 12,380.34 : x
  2. Step 2: Convert to fraction form
    20,339/28,066.28 = 12,380.34/x
  3. Step 3: Cross multiply
    20,339x = 28,066.28 × 12,380.34
  4. Step 4: Simplify right side
    20,339x = 347,470,088.94
  5. Step 5: Solve for x
    x = 347,470,088.94/20,339
  6. Step 6: Final answer
    x = 17,083.93

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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.