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Finding the Fourth Proportional to 489.44, 675.54 and 378.57

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Solution

The fourth proportional to 489.44, 675.54 and 378.57 is: 522.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.44 : 675.54 = 378.57 : x
  2. Step 2: Convert to fraction form
    489.44/675.54 = 378.57/x
  3. Step 3: Cross multiply
    489.44x = 675.54 × 378.57
  4. Step 4: Simplify right side
    489.44x = 255,741.71
  5. Step 5: Solve for x
    x = 255,741.71/489.44
  6. Step 6: Final answer
    x = 522.52

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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.