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Finding the Fourth Proportional to 390.16, 585.32 and 207.68

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Solution

The fourth proportional to 390.16, 585.32 and 207.68 is: 311.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.16 : 585.32 = 207.68 : x
  2. Step 2: Convert to fraction form
    390.16/585.32 = 207.68/x
  3. Step 3: Cross multiply
    390.16x = 585.32 × 207.68
  4. Step 4: Simplify right side
    390.16x = 121,559.26
  5. Step 5: Solve for x
    x = 121,559.26/390.16
  6. Step 6: Final answer
    x = 311.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.