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Finding the Fourth Proportional to 896.64, 1,236.80 and 620.16

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Solution

The fourth proportional to 896.64, 1,236.80 and 620.16 is: 855.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.64 : 1,236.80 = 620.16 : x
  2. Step 2: Convert to fraction form
    896.64/1,236.80 = 620.16/x
  3. Step 3: Cross multiply
    896.64x = 1,236.80 × 620.16
  4. Step 4: Simplify right side
    896.64x = 767,013.89
  5. Step 5: Solve for x
    x = 767,013.89/896.64
  6. Step 6: Final answer
    x = 855.43

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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.