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Finding the Fourth Proportional to 489.44, 675.11 and 312.28

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Solution

The fourth proportional to 489.44, 675.11 and 312.28 is: 430.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.44 : 675.11 = 312.28 : x
  2. Step 2: Convert to fraction form
    489.44/675.11 = 312.28/x
  3. Step 3: Cross multiply
    489.44x = 675.11 × 312.28
  4. Step 4: Simplify right side
    489.44x = 210,822.44
  5. Step 5: Solve for x
    x = 210,822.44/489.44
  6. Step 6: Final answer
    x = 430.74

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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.