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Finding the Fourth Proportional to 28,103.80, 42,171.90 and 10,586.20

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Solution

The fourth proportional to 28,103.80, 42,171.90 and 10,586.20 is: 15,885.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,103.80 : 42,171.90 = 10,586.20 : x
  2. Step 2: Convert to fraction form
    28,103.80/42,171.90 = 10,586.20/x
  3. Step 3: Cross multiply
    28,103.80x = 42,171.90 × 10,586.20
  4. Step 4: Simplify right side
    28,103.80x = 446,440,167.78
  5. Step 5: Solve for x
    x = 446,440,167.78/28,103.80
  6. Step 6: Final answer
    x = 15,885.40

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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.