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Finding the Fourth Proportional to 1,419.95, 2,129.78 and 445.52

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Solution

The fourth proportional to 1,419.95, 2,129.78 and 445.52 is: 668.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.95 : 2,129.78 = 445.52 : x
  2. Step 2: Convert to fraction form
    1,419.95/2,129.78 = 445.52/x
  3. Step 3: Cross multiply
    1,419.95x = 2,129.78 × 445.52
  4. Step 4: Simplify right side
    1,419.95x = 948,846.71
  5. Step 5: Solve for x
    x = 948,846.71/1,419.95
  6. Step 6: Final answer
    x = 668.23

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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.