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Finding the Fourth Proportional to 979.60, 1,469.92 and 432.16

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Solution

The fourth proportional to 979.60, 1,469.92 and 432.16 is: 648.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.60 : 1,469.92 = 432.16 : x
  2. Step 2: Convert to fraction form
    979.60/1,469.92 = 432.16/x
  3. Step 3: Cross multiply
    979.60x = 1,469.92 × 432.16
  4. Step 4: Simplify right side
    979.60x = 635,240.63
  5. Step 5: Solve for x
    x = 635,240.63/979.60
  6. Step 6: Final answer
    x = 648.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.