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Finding the Fourth Proportional to 557.18, 768.89 and 305.10

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Solution

The fourth proportional to 557.18, 768.89 and 305.10 is: 421.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.18 : 768.89 = 305.10 : x
  2. Step 2: Convert to fraction form
    557.18/768.89 = 305.10/x
  3. Step 3: Cross multiply
    557.18x = 768.89 × 305.10
  4. Step 4: Simplify right side
    557.18x = 234,586.81
  5. Step 5: Solve for x
    x = 234,586.81/557.18
  6. Step 6: Final answer
    x = 421.03

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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.