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Finding the Fourth Proportional to 489.45, 675.23 and 314.76

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Solution

The fourth proportional to 489.45, 675.23 and 314.76 is: 434.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.45 : 675.23 = 314.76 : x
  2. Step 2: Convert to fraction form
    489.45/675.23 = 314.76/x
  3. Step 3: Cross multiply
    489.45x = 675.23 × 314.76
  4. Step 4: Simplify right side
    489.45x = 212,533.82
  5. Step 5: Solve for x
    x = 212,533.82/489.45
  6. Step 6: Final answer
    x = 434.23

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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.