Home / 15,405.13-21,257.85-8,688.61

Finding the Fourth Proportional to 15,405.13, 21,257.85 and 8,688.61

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Solution

The fourth proportional to 15,405.13, 21,257.85 and 8,688.61 is: 11,989.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,405.13 : 21,257.85 = 8,688.61 : x
  2. Step 2: Convert to fraction form
    15,405.13/21,257.85 = 8,688.61/x
  3. Step 3: Cross multiply
    15,405.13x = 21,257.85 × 8,688.61
  4. Step 4: Simplify right side
    15,405.13x = 184,701,168.09
  5. Step 5: Solve for x
    x = 184,701,168.09/15,405.13
  6. Step 6: Final answer
    x = 11,989.59

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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.