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Finding the Fourth Proportional to 20,885.72, 28,807.50 and 12,819.79

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Solution

The fourth proportional to 20,885.72, 28,807.50 and 12,819.79 is: 17,682.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.72 : 28,807.50 = 12,819.79 : x
  2. Step 2: Convert to fraction form
    20,885.72/28,807.50 = 12,819.79/x
  3. Step 3: Cross multiply
    20,885.72x = 28,807.50 × 12,819.79
  4. Step 4: Simplify right side
    20,885.72x = 369,306,193.42
  5. Step 5: Solve for x
    x = 369,306,193.42/20,885.72
  6. Step 6: Final answer
    x = 17,682.23

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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.