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Finding the Fourth Proportional to 640.24, 882.61 and 528.30

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Solution

The fourth proportional to 640.24, 882.61 and 528.30 is: 728.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.24 : 882.61 = 528.30 : x
  2. Step 2: Convert to fraction form
    640.24/882.61 = 528.30/x
  3. Step 3: Cross multiply
    640.24x = 882.61 × 528.30
  4. Step 4: Simplify right side
    640.24x = 466,282.86
  5. Step 5: Solve for x
    x = 466,282.86/640.24
  6. Step 6: Final answer
    x = 728.29

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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.