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Finding the Fourth Proportional to 485.95, 671.13 and 393.61

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Solution

The fourth proportional to 485.95, 671.13 and 393.61 is: 543.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.95 : 671.13 = 393.61 : x
  2. Step 2: Convert to fraction form
    485.95/671.13 = 393.61/x
  3. Step 3: Cross multiply
    485.95x = 671.13 × 393.61
  4. Step 4: Simplify right side
    485.95x = 264,163.48
  5. Step 5: Solve for x
    x = 264,163.48/485.95
  6. Step 6: Final answer
    x = 543.60

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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.