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Finding the Fourth Proportional to 489.42, 675.62 and 312.62

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Solution

The fourth proportional to 489.42, 675.62 and 312.62 is: 431.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.42 : 675.62 = 312.62 : x
  2. Step 2: Convert to fraction form
    489.42/675.62 = 312.62/x
  3. Step 3: Cross multiply
    489.42x = 675.62 × 312.62
  4. Step 4: Simplify right side
    489.42x = 211,212.32
  5. Step 5: Solve for x
    x = 211,212.32/489.42
  6. Step 6: Final answer
    x = 431.56

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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.