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Finding the Fourth Proportional to 1,272.85, 1,756.62 and 879.19

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Solution

The fourth proportional to 1,272.85, 1,756.62 and 879.19 is: 1,213.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.85 : 1,756.62 = 879.19 : x
  2. Step 2: Convert to fraction form
    1,272.85/1,756.62 = 879.19/x
  3. Step 3: Cross multiply
    1,272.85x = 1,756.62 × 879.19
  4. Step 4: Simplify right side
    1,272.85x = 1,544,398.35
  5. Step 5: Solve for x
    x = 1,544,398.35/1,272.85
  6. Step 6: Final answer
    x = 1,213.34

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Double scale
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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.