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Finding the Fourth Proportional to 896.64, 1,345.20 and 319.68

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Solution

The fourth proportional to 896.64, 1,345.20 and 319.68 is: 479.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.64 : 1,345.20 = 319.68 : x
  2. Step 2: Convert to fraction form
    896.64/1,345.20 = 319.68/x
  3. Step 3: Cross multiply
    896.64x = 1,345.20 × 319.68
  4. Step 4: Simplify right side
    896.64x = 430,033.54
  5. Step 5: Solve for x
    x = 430,033.54/896.64
  6. Step 6: Final answer
    x = 479.61

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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.