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Finding the Fourth Proportional to 1,379.76, 2,069.67 and 405.89

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Solution

The fourth proportional to 1,379.76, 2,069.67 and 405.89 is: 608.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.76 : 2,069.67 = 405.89 : x
  2. Step 2: Convert to fraction form
    1,379.76/2,069.67 = 405.89/x
  3. Step 3: Cross multiply
    1,379.76x = 2,069.67 × 405.89
  4. Step 4: Simplify right side
    1,379.76x = 840,053.18
  5. Step 5: Solve for x
    x = 840,053.18/1,379.76
  6. Step 6: Final answer
    x = 608.84

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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.