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Finding the Fourth Proportional to 624.91, 936.65 and 390.75

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Solution

The fourth proportional to 624.91, 936.65 and 390.75 is: 585.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.91 : 936.65 = 390.75 : x
  2. Step 2: Convert to fraction form
    624.91/936.65 = 390.75/x
  3. Step 3: Cross multiply
    624.91x = 936.65 × 390.75
  4. Step 4: Simplify right side
    624.91x = 365,995.99
  5. Step 5: Solve for x
    x = 365,995.99/624.91
  6. Step 6: Final answer
    x = 585.68

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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.