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Finding the Fourth Proportional to 557.08, 838.90 and 485.80

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Solution

The fourth proportional to 557.08, 838.90 and 485.80 is: 731.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.08 : 838.90 = 485.80 : x
  2. Step 2: Convert to fraction form
    557.08/838.90 = 485.80/x
  3. Step 3: Cross multiply
    557.08x = 838.90 × 485.80
  4. Step 4: Simplify right side
    557.08x = 407,537.62
  5. Step 5: Solve for x
    x = 407,537.62/557.08
  6. Step 6: Final answer
    x = 731.56

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.