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Finding the Fourth Proportional to 500.31, 750.42 and 345.78

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Solution

The fourth proportional to 500.31, 750.42 and 345.78 is: 518.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.31 : 750.42 = 345.78 : x
  2. Step 2: Convert to fraction form
    500.31/750.42 = 345.78/x
  3. Step 3: Cross multiply
    500.31x = 750.42 × 345.78
  4. Step 4: Simplify right side
    500.31x = 259,480.23
  5. Step 5: Solve for x
    x = 259,480.23/500.31
  6. Step 6: Final answer
    x = 518.64

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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.