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Finding the Fourth Proportional to 645.28, 889.68 and 513.52

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Solution

The fourth proportional to 645.28, 889.68 and 513.52 is: 708.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.28 : 889.68 = 513.52 : x
  2. Step 2: Convert to fraction form
    645.28/889.68 = 513.52/x
  3. Step 3: Cross multiply
    645.28x = 889.68 × 513.52
  4. Step 4: Simplify right side
    645.28x = 456,868.47
  5. Step 5: Solve for x
    x = 456,868.47/645.28
  6. Step 6: Final answer
    x = 708.02

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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.