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Finding the Fourth Proportional to 819.38, 1,130.85 and 470.06

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Solution

The fourth proportional to 819.38, 1,130.85 and 470.06 is: 648.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.38 : 1,130.85 = 470.06 : x
  2. Step 2: Convert to fraction form
    819.38/1,130.85 = 470.06/x
  3. Step 3: Cross multiply
    819.38x = 1,130.85 × 470.06
  4. Step 4: Simplify right side
    819.38x = 531,570.18
  5. Step 5: Solve for x
    x = 531,570.18/819.38
  6. Step 6: Final answer
    x = 648.74

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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.