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Finding the Fourth Proportional to 556.87, 768.45 and 320.86

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Solution

The fourth proportional to 556.87, 768.45 and 320.86 is: 442.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.87 : 768.45 = 320.86 : x
  2. Step 2: Convert to fraction form
    556.87/768.45 = 320.86/x
  3. Step 3: Cross multiply
    556.87x = 768.45 × 320.86
  4. Step 4: Simplify right side
    556.87x = 246,564.87
  5. Step 5: Solve for x
    x = 246,564.87/556.87
  6. Step 6: Final answer
    x = 442.77

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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.