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Finding the Fourth Proportional to 13,516.92, 18,656.94 and 7,931.64

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Solution

The fourth proportional to 13,516.92, 18,656.94 and 7,931.64 is: 10,947.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,516.92 : 18,656.94 = 7,931.64 : x
  2. Step 2: Convert to fraction form
    13,516.92/18,656.94 = 7,931.64/x
  3. Step 3: Cross multiply
    13,516.92x = 18,656.94 × 7,931.64
  4. Step 4: Simplify right side
    13,516.92x = 147,980,131.58
  5. Step 5: Solve for x
    x = 147,980,131.58/13,516.92
  6. Step 6: Final answer
    x = 10,947.77

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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.