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Finding the Fourth Proportional to 15,861.83, 21,890.21 and 9,057.86

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Solution

The fourth proportional to 15,861.83, 21,890.21 and 9,057.86 is: 12,500.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.83 : 21,890.21 = 9,057.86 : x
  2. Step 2: Convert to fraction form
    15,861.83/21,890.21 = 9,057.86/x
  3. Step 3: Cross multiply
    15,861.83x = 21,890.21 × 9,057.86
  4. Step 4: Simplify right side
    15,861.83x = 198,278,302.81
  5. Step 5: Solve for x
    x = 198,278,302.81/15,861.83
  6. Step 6: Final answer
    x = 12,500.35

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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.