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Finding the Fourth Proportional to 500.78, 750.86 and 208.43

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Solution

The fourth proportional to 500.78, 750.86 and 208.43 is: 312.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.78 : 750.86 = 208.43 : x
  2. Step 2: Convert to fraction form
    500.78/750.86 = 208.43/x
  3. Step 3: Cross multiply
    500.78x = 750.86 × 208.43
  4. Step 4: Simplify right side
    500.78x = 156,496.95
  5. Step 5: Solve for x
    x = 156,496.95/500.78
  6. Step 6: Final answer
    x = 312.50

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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.