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Finding the Fourth Proportional to 896.28, 1,235.16 and 647.15

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Solution

The fourth proportional to 896.28, 1,235.16 and 647.15 is: 891.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.28 : 1,235.16 = 647.15 : x
  2. Step 2: Convert to fraction form
    896.28/1,235.16 = 647.15/x
  3. Step 3: Cross multiply
    896.28x = 1,235.16 × 647.15
  4. Step 4: Simplify right side
    896.28x = 799,327.62
  5. Step 5: Solve for x
    x = 799,327.62/896.28
  6. Step 6: Final answer
    x = 891.83

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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.