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Finding the Fourth Proportional to 485.93, 671.04 and 311.58

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Solution

The fourth proportional to 485.93, 671.04 and 311.58 is: 430.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.93 : 671.04 = 311.58 : x
  2. Step 2: Convert to fraction form
    485.93/671.04 = 311.58/x
  3. Step 3: Cross multiply
    485.93x = 671.04 × 311.58
  4. Step 4: Simplify right side
    485.93x = 209,077.73
  5. Step 5: Solve for x
    x = 209,077.73/485.93
  6. Step 6: Final answer
    x = 430.27

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