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Finding the Fourth Proportional to 388.66, 536.64 and 305.68

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Solution

The fourth proportional to 388.66, 536.64 and 305.68 is: 422.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.66 : 536.64 = 305.68 : x
  2. Step 2: Convert to fraction form
    388.66/536.64 = 305.68/x
  3. Step 3: Cross multiply
    388.66x = 536.64 × 305.68
  4. Step 4: Simplify right side
    388.66x = 164,040.12
  5. Step 5: Solve for x
    x = 164,040.12/388.66
  6. Step 6: Final answer
    x = 422.07

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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.