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Finding the Fourth Proportional to 390.63, 585.87 and 207.93

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Solution

The fourth proportional to 390.63, 585.87 and 207.93 is: 311.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.63 : 585.87 = 207.93 : x
  2. Step 2: Convert to fraction form
    390.63/585.87 = 207.93/x
  3. Step 3: Cross multiply
    390.63x = 585.87 × 207.93
  4. Step 4: Simplify right side
    390.63x = 121,819.95
  5. Step 5: Solve for x
    x = 121,819.95/390.63
  6. Step 6: Final answer
    x = 311.86

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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.