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Finding the Fourth Proportional to 1,346.39, 2,019.94 and 421.98

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Solution

The fourth proportional to 1,346.39, 2,019.94 and 421.98 is: 633.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,346.39 : 2,019.94 = 421.98 : x
  2. Step 2: Convert to fraction form
    1,346.39/2,019.94 = 421.98/x
  3. Step 3: Cross multiply
    1,346.39x = 2,019.94 × 421.98
  4. Step 4: Simplify right side
    1,346.39x = 852,365.65
  5. Step 5: Solve for x
    x = 852,365.65/1,346.39
  6. Step 6: Final answer
    x = 633.08

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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.