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Finding the Fourth Proportional to 485.74, 727.80 and 340.75

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Solution

The fourth proportional to 485.74, 727.80 and 340.75 is: 510.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.74 : 727.80 = 340.75 : x
  2. Step 2: Convert to fraction form
    485.74/727.80 = 340.75/x
  3. Step 3: Cross multiply
    485.74x = 727.80 × 340.75
  4. Step 4: Simplify right side
    485.74x = 247,997.85
  5. Step 5: Solve for x
    x = 247,997.85/485.74
  6. Step 6: Final answer
    x = 510.56

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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.