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Finding the Fourth Proportional to 489.24, 671.40 and 445.32

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Solution

The fourth proportional to 489.24, 671.40 and 445.32 is: 611.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.24 : 671.40 = 445.32 : x
  2. Step 2: Convert to fraction form
    489.24/671.40 = 445.32/x
  3. Step 3: Cross multiply
    489.24x = 671.40 × 445.32
  4. Step 4: Simplify right side
    489.24x = 298,987.85
  5. Step 5: Solve for x
    x = 298,987.85/489.24
  6. Step 6: Final answer
    x = 611.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.