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Finding the Fourth Proportional to 1,379.82, 2,070.09 and 405.93

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Solution

The fourth proportional to 1,379.82, 2,070.09 and 405.93 is: 609.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.82 : 2,070.09 = 405.93 : x
  2. Step 2: Convert to fraction form
    1,379.82/2,070.09 = 405.93/x
  3. Step 3: Cross multiply
    1,379.82x = 2,070.09 × 405.93
  4. Step 4: Simplify right side
    1,379.82x = 840,311.63
  5. Step 5: Solve for x
    x = 840,311.63/1,379.82
  6. Step 6: Final answer
    x = 609.00

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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.