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Finding the Fourth Proportional to 819.15, 1,130.30 and 464.91

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Solution

The fourth proportional to 819.15, 1,130.30 and 464.91 is: 641.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.15 : 1,130.30 = 464.91 : x
  2. Step 2: Convert to fraction form
    819.15/1,130.30 = 464.91/x
  3. Step 3: Cross multiply
    819.15x = 1,130.30 × 464.91
  4. Step 4: Simplify right side
    819.15x = 525,485.45
  5. Step 5: Solve for x
    x = 525,485.45/819.15
  6. Step 6: Final answer
    x = 641.50

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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.