Home / 15,401.35-21,255.11-8,688.61

Finding the Fourth Proportional to 15,401.35, 21,255.11 and 8,688.61

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Solution

The fourth proportional to 15,401.35, 21,255.11 and 8,688.61 is: 11,990.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,401.35 : 21,255.11 = 8,688.61 : x
  2. Step 2: Convert to fraction form
    15,401.35/21,255.11 = 8,688.61/x
  3. Step 3: Cross multiply
    15,401.35x = 21,255.11 × 8,688.61
  4. Step 4: Simplify right side
    15,401.35x = 184,677,361.30
  5. Step 5: Solve for x
    x = 184,677,361.30/15,401.35
  6. Step 6: Final answer
    x = 11,990.99

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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.