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Finding the Fourth Proportional to 557.55, 768.30 and 518.63

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Solution

The fourth proportional to 557.55, 768.30 and 518.63 is: 714.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.55 : 768.30 = 518.63 : x
  2. Step 2: Convert to fraction form
    557.55/768.30 = 518.63/x
  3. Step 3: Cross multiply
    557.55x = 768.30 × 518.63
  4. Step 4: Simplify right side
    557.55x = 398,463.43
  5. Step 5: Solve for x
    x = 398,463.43/557.55
  6. Step 6: Final answer
    x = 714.67

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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.