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Finding the Fourth Proportional to 405,686.52, 608,400.34 and 139,382.84

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Solution

The fourth proportional to 405,686.52, 608,400.34 and 139,382.84 is: 209,029.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,686.52 : 608,400.34 = 139,382.84 : x
  2. Step 2: Convert to fraction form
    405,686.52/608,400.34 = 139,382.84/x
  3. Step 3: Cross multiply
    405,686.52x = 608,400.34 × 139,382.84
  4. Step 4: Simplify right side
    405,686.52x = 84,800,567,246.17
  5. Step 5: Solve for x
    x = 84,800,567,246.17/405,686.52
  6. Step 6: Final answer
    x = 209,029.79

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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.