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Finding the Fourth Proportional to 20,992.84, 28,972.18 and 15,678.44

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Solution

The fourth proportional to 20,992.84, 28,972.18 and 15,678.44 is: 21,637.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.84 : 28,972.18 = 15,678.44 : x
  2. Step 2: Convert to fraction form
    20,992.84/28,972.18 = 15,678.44/x
  3. Step 3: Cross multiply
    20,992.84x = 28,972.18 × 15,678.44
  4. Step 4: Simplify right side
    20,992.84x = 454,238,585.80
  5. Step 5: Solve for x
    x = 454,238,585.80/20,992.84
  6. Step 6: Final answer
    x = 21,637.79

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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.