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Finding the Fourth Proportional to 890.64, 1,334.56 and 684.96

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Solution

The fourth proportional to 890.64, 1,334.56 and 684.96 is: 1,026.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.64 : 1,334.56 = 684.96 : x
  2. Step 2: Convert to fraction form
    890.64/1,334.56 = 684.96/x
  3. Step 3: Cross multiply
    890.64x = 1,334.56 × 684.96
  4. Step 4: Simplify right side
    890.64x = 914,120.22
  5. Step 5: Solve for x
    x = 914,120.22/890.64
  6. Step 6: Final answer
    x = 1,026.36

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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.