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Finding the Fourth Proportional to 556.38, 767.81 and 388.58

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Solution

The fourth proportional to 556.38, 767.81 and 388.58 is: 536.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.38 : 767.81 = 388.58 : x
  2. Step 2: Convert to fraction form
    556.38/767.81 = 388.58/x
  3. Step 3: Cross multiply
    556.38x = 767.81 × 388.58
  4. Step 4: Simplify right side
    556.38x = 298,355.14
  5. Step 5: Solve for x
    x = 298,355.14/556.38
  6. Step 6: Final answer
    x = 536.24

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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.