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Finding the Fourth Proportional to 819.36, 1,130.64 and 664.48

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Solution

The fourth proportional to 819.36, 1,130.64 and 664.48 is: 916.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.36 : 1,130.64 = 664.48 : x
  2. Step 2: Convert to fraction form
    819.36/1,130.64 = 664.48/x
  3. Step 3: Cross multiply
    819.36x = 1,130.64 × 664.48
  4. Step 4: Simplify right side
    819.36x = 751,287.67
  5. Step 5: Solve for x
    x = 751,287.67/819.36
  6. Step 6: Final answer
    x = 916.92

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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.