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Finding the Fourth Proportional to 1,419.76, 2,129.62 and 393.76

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Solution

The fourth proportional to 1,419.76, 2,129.62 and 393.76 is: 590.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.76 : 2,129.62 = 393.76 : x
  2. Step 2: Convert to fraction form
    1,419.76/2,129.62 = 393.76/x
  3. Step 3: Cross multiply
    1,419.76x = 2,129.62 × 393.76
  4. Step 4: Simplify right side
    1,419.76x = 838,559.17
  5. Step 5: Solve for x
    x = 838,559.17/1,419.76
  6. Step 6: Final answer
    x = 590.63

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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.