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Finding the Fourth Proportional to 405,589.86, 608,398.90 and 139,348.42

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Solution

The fourth proportional to 405,589.86, 608,398.90 and 139,348.42 is: 209,027.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,589.86 : 608,398.90 = 139,348.42 : x
  2. Step 2: Convert to fraction form
    405,589.86/608,398.90 = 139,348.42/x
  3. Step 3: Cross multiply
    405,589.86x = 608,398.90 × 139,348.42
  4. Step 4: Simplify right side
    405,589.86x = 84,779,423,575.37
  5. Step 5: Solve for x
    x = 84,779,423,575.37/405,589.86
  6. Step 6: Final answer
    x = 209,027.47

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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.