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Finding the Fourth Proportional to 1,272.39, 1,755.78 and 712.78

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Solution

The fourth proportional to 1,272.39, 1,755.78 and 712.78 is: 983.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.39 : 1,755.78 = 712.78 : x
  2. Step 2: Convert to fraction form
    1,272.39/1,755.78 = 712.78/x
  3. Step 3: Cross multiply
    1,272.39x = 1,755.78 × 712.78
  4. Step 4: Simplify right side
    1,272.39x = 1,251,484.87
  5. Step 5: Solve for x
    x = 1,251,484.87/1,272.39
  6. Step 6: Final answer
    x = 983.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.