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Finding the Fourth Proportional to 557.76, 835.20 and 485.04

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Solution

The fourth proportional to 557.76, 835.20 and 485.04 is: 726.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.76 : 835.20 = 485.04 : x
  2. Step 2: Convert to fraction form
    557.76/835.20 = 485.04/x
  3. Step 3: Cross multiply
    557.76x = 835.20 × 485.04
  4. Step 4: Simplify right side
    557.76x = 405,105.41
  5. Step 5: Solve for x
    x = 405,105.41/557.76
  6. Step 6: Final answer
    x = 726.31

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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.