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Finding the Fourth Proportional to 1,279.60, 1,764.93 and 900.88

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Solution

The fourth proportional to 1,279.60, 1,764.93 and 900.88 is: 1,242.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.60 : 1,764.93 = 900.88 : x
  2. Step 2: Convert to fraction form
    1,279.60/1,764.93 = 900.88/x
  3. Step 3: Cross multiply
    1,279.60x = 1,764.93 × 900.88
  4. Step 4: Simplify right side
    1,279.60x = 1,589,990.14
  5. Step 5: Solve for x
    x = 1,589,990.14/1,279.60
  6. Step 6: Final answer
    x = 1,242.57

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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.