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Finding the Fourth Proportional to 511.60, 705.78 and 345.75

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Solution

The fourth proportional to 511.60, 705.78 and 345.75 is: 476.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.60 : 705.78 = 345.75 : x
  2. Step 2: Convert to fraction form
    511.60/705.78 = 345.75/x
  3. Step 3: Cross multiply
    511.60x = 705.78 × 345.75
  4. Step 4: Simplify right side
    511.60x = 244,023.44
  5. Step 5: Solve for x
    x = 244,023.44/511.60
  6. Step 6: Final answer
    x = 476.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.