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Finding the Fourth Proportional to 210,781.80, 290,999.24 and 139,368.96

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Solution

The fourth proportional to 210,781.80, 290,999.24 and 139,368.96 is: 192,408.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,781.80 : 290,999.24 = 139,368.96 : x
  2. Step 2: Convert to fraction form
    210,781.80/290,999.24 = 139,368.96/x
  3. Step 3: Cross multiply
    210,781.80x = 290,999.24 × 139,368.96
  4. Step 4: Simplify right side
    210,781.80x = 40,556,261,439.59
  5. Step 5: Solve for x
    x = 40,556,261,439.59/210,781.80
  6. Step 6: Final answer
    x = 192,408.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.