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Finding the Fourth Proportional to 15,312.38, 21,129.86 and 8,595.86

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Solution

The fourth proportional to 15,312.38, 21,129.86 and 8,595.86 is: 11,861.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,312.38 : 21,129.86 = 8,595.86 : x
  2. Step 2: Convert to fraction form
    15,312.38/21,129.86 = 8,595.86/x
  3. Step 3: Cross multiply
    15,312.38x = 21,129.86 × 8,595.86
  4. Step 4: Simplify right side
    15,312.38x = 181,629,234.22
  5. Step 5: Solve for x
    x = 181,629,234.22/15,312.38
  6. Step 6: Final answer
    x = 11,861.60

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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.