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Finding the Third Proportional to 1,172.81 and 1,256.63

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Solution

The third proportional to 1,172.81 and 1,256.63 is: 1,346.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.81 : 1,256.63 = 1,256.63 : x
  2. Step 2: Convert to fraction form
    1,172.81/1,256.63 = 1,256.63/x
  3. Step 3: Cross multiply
    1,172.81x = 1,256.63 × 1,256.63
  4. Step 4: Simplify right side
    1,172.81x = 1,579,106.39
  5. Step 5: Solve for x
    x = 1,579,106.39/1,172.81
  6. Step 6: Final answer
    x = 1,346.43

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.