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Finding the Third Proportional to 71,520 and 105,120

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Solution

The third proportional to 71,520 and 105,120 is: 154,505.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,520 : 105,120 = 105,120 : x
  2. Step 2: Convert to fraction form
    71,520/105,120 = 105,120/x
  3. Step 3: Cross multiply
    71,520x = 105,120 × 105,120
  4. Step 4: Simplify right side
    71,520x = 11,050,214,400
  5. Step 5: Solve for x
    x = 11,050,214,400/71,520
  6. Step 6: Final answer
    x = 154,505.23

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.