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Finding the Fourth Proportional to 1,379.18, 2,069.07 and 405.35

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Solution

The fourth proportional to 1,379.18, 2,069.07 and 405.35 is: 608.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.18 : 2,069.07 = 405.35 : x
  2. Step 2: Convert to fraction form
    1,379.18/2,069.07 = 405.35/x
  3. Step 3: Cross multiply
    1,379.18x = 2,069.07 × 405.35
  4. Step 4: Simplify right side
    1,379.18x = 838,695.50
  5. Step 5: Solve for x
    x = 838,695.50/1,379.18
  6. Step 6: Final answer
    x = 608.11

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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.