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Finding the Fourth Proportional to 489.60, 672.96 and 431.04

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Solution

The fourth proportional to 489.60, 672.96 and 431.04 is: 592.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.60 : 672.96 = 431.04 : x
  2. Step 2: Convert to fraction form
    489.60/672.96 = 431.04/x
  3. Step 3: Cross multiply
    489.60x = 672.96 × 431.04
  4. Step 4: Simplify right side
    489.60x = 290,072.68
  5. Step 5: Solve for x
    x = 290,072.68/489.60
  6. Step 6: Final answer
    x = 592.47

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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.