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Finding the Fourth Proportional to 1,419.96, 2,129.76 and 380.04

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Solution

The fourth proportional to 1,419.96, 2,129.76 and 380.04 is: 570.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.96 : 2,129.76 = 380.04 : x
  2. Step 2: Convert to fraction form
    1,419.96/2,129.76 = 380.04/x
  3. Step 3: Cross multiply
    1,419.96x = 2,129.76 × 380.04
  4. Step 4: Simplify right side
    1,419.96x = 809,393.99
  5. Step 5: Solve for x
    x = 809,393.99/1,419.96
  6. Step 6: Final answer
    x = 570.01

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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.