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Finding the Fourth Proportional to 485.31, 727.46 and 192.40

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Solution

The fourth proportional to 485.31, 727.46 and 192.40 is: 288.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.31 : 727.46 = 192.40 : x
  2. Step 2: Convert to fraction form
    485.31/727.46 = 192.40/x
  3. Step 3: Cross multiply
    485.31x = 727.46 × 192.40
  4. Step 4: Simplify right side
    485.31x = 139,963.30
  5. Step 5: Solve for x
    x = 139,963.30/485.31
  6. Step 6: Final answer
    x = 288.40

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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.