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Finding the Fourth Proportional to 556.20, 767.62 and 320.22

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Solution

The fourth proportional to 556.20, 767.62 and 320.22 is: 441.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.20 : 767.62 = 320.22 : x
  2. Step 2: Convert to fraction form
    556.20/767.62 = 320.22/x
  3. Step 3: Cross multiply
    556.20x = 767.62 × 320.22
  4. Step 4: Simplify right side
    556.20x = 245,808.39
  5. Step 5: Solve for x
    x = 245,808.39/556.20
  6. Step 6: Final answer
    x = 441.94

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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.