Home / 12,688.10-17,518.18-7,909.96

Finding the Fourth Proportional to 12,688.10, 17,518.18 and 7,909.96

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Solution

The fourth proportional to 12,688.10, 17,518.18 and 7,909.96 is: 10,921.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,688.10 : 17,518.18 = 7,909.96 : x
  2. Step 2: Convert to fraction form
    12,688.10/17,518.18 = 7,909.96/x
  3. Step 3: Cross multiply
    12,688.10x = 17,518.18 × 7,909.96
  4. Step 4: Simplify right side
    12,688.10x = 138,568,103.07
  5. Step 5: Solve for x
    x = 138,568,103.07/12,688.10
  6. Step 6: Final answer
    x = 10,921.11

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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.