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Finding the Fourth Proportional to 819.16, 1,130.31 and 469.78

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Solution

The fourth proportional to 819.16, 1,130.31 and 469.78 is: 648.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.16 : 1,130.31 = 469.78 : x
  2. Step 2: Convert to fraction form
    819.16/1,130.31 = 469.78/x
  3. Step 3: Cross multiply
    819.16x = 1,130.31 × 469.78
  4. Step 4: Simplify right side
    819.16x = 530,997.03
  5. Step 5: Solve for x
    x = 530,997.03/819.16
  6. Step 6: Final answer
    x = 648.22

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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.