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Finding the Third Proportional to 78,210 and 121,158

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Solution

The third proportional to 78,210 and 121,158 is: 187,690.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,210 : 121,158 = 121,158 : x
  2. Step 2: Convert to fraction form
    78,210/121,158 = 121,158/x
  3. Step 3: Cross multiply
    78,210x = 121,158 × 121,158
  4. Step 4: Simplify right side
    78,210x = 14,679,260,964
  5. Step 5: Solve for x
    x = 14,679,260,964/78,210
  6. Step 6: Final answer
    x = 187,690.33

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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.