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Finding the Third Proportional to 84,240 and 131,428

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Solution

The third proportional to 84,240 and 131,428 is: 205,048.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,240 : 131,428 = 131,428 : x
  2. Step 2: Convert to fraction form
    84,240/131,428 = 131,428/x
  3. Step 3: Cross multiply
    84,240x = 131,428 × 131,428
  4. Step 4: Simplify right side
    84,240x = 17,273,319,184
  5. Step 5: Solve for x
    x = 17,273,319,184/84,240
  6. Step 6: Final answer
    x = 205,048.90

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.