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Finding the Fourth Proportional to 390.11, 585.25 and 146.64

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Solution

The fourth proportional to 390.11, 585.25 and 146.64 is: 219.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.11 : 585.25 = 146.64 : x
  2. Step 2: Convert to fraction form
    390.11/585.25 = 146.64/x
  3. Step 3: Cross multiply
    390.11x = 585.25 × 146.64
  4. Step 4: Simplify right side
    390.11x = 85,820.42
  5. Step 5: Solve for x
    x = 85,820.42/390.11
  6. Step 6: Final answer
    x = 219.99

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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.