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Finding the Fourth Proportional to 556.64, 768.08 and 320.56

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Solution

The fourth proportional to 556.64, 768.08 and 320.56 is: 442.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.64 : 768.08 = 320.56 : x
  2. Step 2: Convert to fraction form
    556.64/768.08 = 320.56/x
  3. Step 3: Cross multiply
    556.64x = 768.08 × 320.56
  4. Step 4: Simplify right side
    556.64x = 246,215.72
  5. Step 5: Solve for x
    x = 246,215.72/556.64
  6. Step 6: Final answer
    x = 442.32

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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.