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Finding the Fourth Proportional to 1,219.76, 1,830 and 354.16

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Solution

The fourth proportional to 1,219.76, 1,830 and 354.16 is: 531.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.76 : 1,830 = 354.16 : x
  2. Step 2: Convert to fraction form
    1,219.76/1,830 = 354.16/x
  3. Step 3: Cross multiply
    1,219.76x = 1,830 × 354.16
  4. Step 4: Simplify right side
    1,219.76x = 648,112.80
  5. Step 5: Solve for x
    x = 648,112.80/1,219.76
  6. Step 6: Final answer
    x = 531.34

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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.