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Finding the Fourth Proportional to 897.28, 1,345.92 and 319.75

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Solution

The fourth proportional to 897.28, 1,345.92 and 319.75 is: 479.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.28 : 1,345.92 = 319.75 : x
  2. Step 2: Convert to fraction form
    897.28/1,345.92 = 319.75/x
  3. Step 3: Cross multiply
    897.28x = 1,345.92 × 319.75
  4. Step 4: Simplify right side
    897.28x = 430,357.92
  5. Step 5: Solve for x
    x = 430,357.92/897.28
  6. Step 6: Final answer
    x = 479.63

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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.