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Finding the Third Proportional to 78,156 and 121,200

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Solution

The third proportional to 78,156 and 121,200 is: 187,950.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,156 : 121,200 = 121,200 : x
  2. Step 2: Convert to fraction form
    78,156/121,200 = 121,200/x
  3. Step 3: Cross multiply
    78,156x = 121,200 × 121,200
  4. Step 4: Simplify right side
    78,156x = 14,689,440,000
  5. Step 5: Solve for x
    x = 14,689,440,000/78,156
  6. Step 6: Final answer
    x = 187,950.25

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.