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Finding the Fourth Proportional to 139,709.21, 209,567.45 and 66,663.41

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Solution

The fourth proportional to 139,709.21, 209,567.45 and 66,663.41 is: 99,996.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,709.21 : 209,567.45 = 66,663.41 : x
  2. Step 2: Convert to fraction form
    139,709.21/209,567.45 = 66,663.41/x
  3. Step 3: Cross multiply
    139,709.21x = 209,567.45 × 66,663.41
  4. Step 4: Simplify right side
    139,709.21x = 13,970,479,960.83
  5. Step 5: Solve for x
    x = 13,970,479,960.83/139,709.21
  6. Step 6: Final answer
    x = 99,996.85

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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.