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Finding the Third Proportional to 72,428 and 102,521

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Solution

The third proportional to 72,428 and 102,521 is: 145,117.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,428 : 102,521 = 102,521 : x
  2. Step 2: Convert to fraction form
    72,428/102,521 = 102,521/x
  3. Step 3: Cross multiply
    72,428x = 102,521 × 102,521
  4. Step 4: Simplify right side
    72,428x = 10,510,555,441
  5. Step 5: Solve for x
    x = 10,510,555,441/72,428
  6. Step 6: Final answer
    x = 145,117.29

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.