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Finding the Fourth Proportional to 489.50, 675.55 and 282.50

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Solution

The fourth proportional to 489.50, 675.55 and 282.50 is: 389.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.50 : 675.55 = 282.50 : x
  2. Step 2: Convert to fraction form
    489.50/675.55 = 282.50/x
  3. Step 3: Cross multiply
    489.50x = 675.55 × 282.50
  4. Step 4: Simplify right side
    489.50x = 190,842.88
  5. Step 5: Solve for x
    x = 190,842.88/489.50
  6. Step 6: Final answer
    x = 389.87

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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.