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Finding the Third Proportional to 128,688 and 202,080

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Solution

The third proportional to 128,688 and 202,080 is: 317,328.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,688 : 202,080 = 202,080 : x
  2. Step 2: Convert to fraction form
    128,688/202,080 = 202,080/x
  3. Step 3: Cross multiply
    128,688x = 202,080 × 202,080
  4. Step 4: Simplify right side
    128,688x = 40,836,326,400
  5. Step 5: Solve for x
    x = 40,836,326,400/128,688
  6. Step 6: Final answer
    x = 317,328.16

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.