Home / 10,013.72-13,811.60-8,685.12

Finding the Fourth Proportional to 10,013.72, 13,811.60 and 8,685.12

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Solution

The fourth proportional to 10,013.72, 13,811.60 and 8,685.12 is: 11,979.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,013.72 : 13,811.60 = 8,685.12 : x
  2. Step 2: Convert to fraction form
    10,013.72/13,811.60 = 8,685.12/x
  3. Step 3: Cross multiply
    10,013.72x = 13,811.60 × 8,685.12
  4. Step 4: Simplify right side
    10,013.72x = 119,955,403.39
  5. Step 5: Solve for x
    x = 119,955,403.39/10,013.72
  6. Step 6: Final answer
    x = 11,979.11

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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.