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Finding the Third Proportional to 7,312.78 and 11,558.64

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Solution

The third proportional to 7,312.78 and 11,558.64 is: 18,269.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,312.78 : 11,558.64 = 11,558.64 : x
  2. Step 2: Convert to fraction form
    7,312.78/11,558.64 = 11,558.64/x
  3. Step 3: Cross multiply
    7,312.78x = 11,558.64 × 11,558.64
  4. Step 4: Simplify right side
    7,312.78x = 133,602,082.80
  5. Step 5: Solve for x
    x = 133,602,082.80/7,312.78
  6. Step 6: Final answer
    x = 18,269.67

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.