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Finding the Fourth Proportional to 557.76, 768.48 and 487.28

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Solution

The fourth proportional to 557.76, 768.48 and 487.28 is: 671.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.76 : 768.48 = 487.28 : x
  2. Step 2: Convert to fraction form
    557.76/768.48 = 487.28/x
  3. Step 3: Cross multiply
    557.76x = 768.48 × 487.28
  4. Step 4: Simplify right side
    557.76x = 374,464.93
  5. Step 5: Solve for x
    x = 374,464.93/557.76
  6. Step 6: Final answer
    x = 671.37

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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.