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Finding the Fourth Proportional to 421,136.86, 581,167.92 and 239,848.78

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Solution

The fourth proportional to 421,136.86, 581,167.92 and 239,848.78 is: 330,990.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,136.86 : 581,167.92 = 239,848.78 : x
  2. Step 2: Convert to fraction form
    421,136.86/581,167.92 = 239,848.78/x
  3. Step 3: Cross multiply
    421,136.86x = 581,167.92 × 239,848.78
  4. Step 4: Simplify right side
    421,136.86x = 139,392,416,587.14
  5. Step 5: Solve for x
    x = 139,392,416,587.14/421,136.86
  6. Step 6: Final answer
    x = 330,990.78

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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.