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Finding the Fourth Proportional to 139,128.60, 208,668.70 and 64,242.41

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Solution

The fourth proportional to 139,128.60, 208,668.70 and 64,242.41 is: 96,352.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,128.60 : 208,668.70 = 64,242.41 : x
  2. Step 2: Convert to fraction form
    139,128.60/208,668.70 = 64,242.41/x
  3. Step 3: Cross multiply
    139,128.60x = 208,668.70 × 64,242.41
  4. Step 4: Simplify right side
    139,128.60x = 13,405,379,858.36
  5. Step 5: Solve for x
    x = 13,405,379,858.36/139,128.60
  6. Step 6: Final answer
    x = 96,352.44

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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.