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Finding the Third Proportional to 78,113 and 121,139

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Solution

The third proportional to 78,113 and 121,139 is: 187,864.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,113 : 121,139 = 121,139 : x
  2. Step 2: Convert to fraction form
    78,113/121,139 = 121,139/x
  3. Step 3: Cross multiply
    78,113x = 121,139 × 121,139
  4. Step 4: Simplify right side
    78,113x = 14,674,657,321
  5. Step 5: Solve for x
    x = 14,674,657,321/78,113
  6. Step 6: Final answer
    x = 187,864.47

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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.