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Finding the Fourth Proportional to 2,659.70, 3,991.36 and 928.32

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Solution

The fourth proportional to 2,659.70, 3,991.36 and 928.32 is: 1,393.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,659.70 : 3,991.36 = 928.32 : x
  2. Step 2: Convert to fraction form
    2,659.70/3,991.36 = 928.32/x
  3. Step 3: Cross multiply
    2,659.70x = 3,991.36 × 928.32
  4. Step 4: Simplify right side
    2,659.70x = 3,705,256.99
  5. Step 5: Solve for x
    x = 3,705,256.99/2,659.70
  6. Step 6: Final answer
    x = 1,393.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.