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Finding the Fourth Proportional to 639.33, 881.53 and 470.52

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Solution

The fourth proportional to 639.33, 881.53 and 470.52 is: 648.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.33 : 881.53 = 470.52 : x
  2. Step 2: Convert to fraction form
    639.33/881.53 = 470.52/x
  3. Step 3: Cross multiply
    639.33x = 881.53 × 470.52
  4. Step 4: Simplify right side
    639.33x = 414,777.50
  5. Step 5: Solve for x
    x = 414,777.50/639.33
  6. Step 6: Final answer
    x = 648.77

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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.