Home / 15,516.81-21,390.24-12,109.96

Finding the Fourth Proportional to 15,516.81, 21,390.24 and 12,109.96

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Solution

The fourth proportional to 15,516.81, 21,390.24 and 12,109.96 is: 16,693.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,516.81 : 21,390.24 = 12,109.96 : x
  2. Step 2: Convert to fraction form
    15,516.81/21,390.24 = 12,109.96/x
  3. Step 3: Cross multiply
    15,516.81x = 21,390.24 × 12,109.96
  4. Step 4: Simplify right side
    15,516.81x = 259,034,783.29
  5. Step 5: Solve for x
    x = 259,034,783.29/15,516.81
  6. Step 6: Final answer
    x = 16,693.82

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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.