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Finding the Fourth Proportional to 485.82, 670.19 and 289.17

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Solution

The fourth proportional to 485.82, 670.19 and 289.17 is: 398.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.82 : 670.19 = 289.17 : x
  2. Step 2: Convert to fraction form
    485.82/670.19 = 289.17/x
  3. Step 3: Cross multiply
    485.82x = 670.19 × 289.17
  4. Step 4: Simplify right side
    485.82x = 193,797.40
  5. Step 5: Solve for x
    x = 193,797.40/485.82
  6. Step 6: Final answer
    x = 398.91

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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.