Home / 1,279.35-1,764.59-900.63

Finding the Fourth Proportional to 1,279.35, 1,764.59 and 900.63

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Solution

The fourth proportional to 1,279.35, 1,764.59 and 900.63 is: 1,242.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.35 : 1,764.59 = 900.63 : x
  2. Step 2: Convert to fraction form
    1,279.35/1,764.59 = 900.63/x
  3. Step 3: Cross multiply
    1,279.35x = 1,764.59 × 900.63
  4. Step 4: Simplify right side
    1,279.35x = 1,589,238.19
  5. Step 5: Solve for x
    x = 1,589,238.19/1,279.35
  6. Step 6: Final answer
    x = 1,242.22

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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.