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Finding the Fourth Proportional to 390.16, 588.67 and 386.92

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Solution

The fourth proportional to 390.16, 588.67 and 386.92 is: 583.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.16 : 588.67 = 386.92 : x
  2. Step 2: Convert to fraction form
    390.16/588.67 = 386.92/x
  3. Step 3: Cross multiply
    390.16x = 588.67 × 386.92
  4. Step 4: Simplify right side
    390.16x = 227,768.20
  5. Step 5: Solve for x
    x = 227,768.20/390.16
  6. Step 6: Final answer
    x = 583.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.