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Finding the Fourth Proportional to 896.30, 1,345.28 and 485.76

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Solution

The fourth proportional to 896.30, 1,345.28 and 485.76 is: 729.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.30 : 1,345.28 = 485.76 : x
  2. Step 2: Convert to fraction form
    896.30/1,345.28 = 485.76/x
  3. Step 3: Cross multiply
    896.30x = 1,345.28 × 485.76
  4. Step 4: Simplify right side
    896.30x = 653,480.78
  5. Step 5: Solve for x
    x = 653,480.78/896.30
  6. Step 6: Final answer
    x = 729.09

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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.