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Finding the Fourth Proportional to 400.86, 601.50 and 208.50

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Solution

The fourth proportional to 400.86, 601.50 and 208.50 is: 312.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.86 : 601.50 = 208.50 : x
  2. Step 2: Convert to fraction form
    400.86/601.50 = 208.50/x
  3. Step 3: Cross multiply
    400.86x = 601.50 × 208.50
  4. Step 4: Simplify right side
    400.86x = 125,412.75
  5. Step 5: Solve for x
    x = 125,412.75/400.86
  6. Step 6: Final answer
    x = 312.86

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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.