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Finding the Fourth Proportional to 1,345.73, 2,019 and 421.39

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Solution

The fourth proportional to 1,345.73, 2,019 and 421.39 is: 632.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.73 : 2,019 = 421.39 : x
  2. Step 2: Convert to fraction form
    1,345.73/2,019 = 421.39/x
  3. Step 3: Cross multiply
    1,345.73x = 2,019 × 421.39
  4. Step 4: Simplify right side
    1,345.73x = 850,781.36
  5. Step 5: Solve for x
    x = 850,781.36/1,345.73
  6. Step 6: Final answer
    x = 632.21

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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.