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Finding the Fourth Proportional to 139,636.71, 209,331.54 and 55,455.84

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Solution

The fourth proportional to 139,636.71, 209,331.54 and 55,455.84 is: 83,134.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,636.71 : 209,331.54 = 55,455.84 : x
  2. Step 2: Convert to fraction form
    139,636.71/209,331.54 = 55,455.84/x
  3. Step 3: Cross multiply
    139,636.71x = 209,331.54 × 55,455.84
  4. Step 4: Simplify right side
    139,636.71x = 11,608,656,389.19
  5. Step 5: Solve for x
    x = 11,608,656,389.19/139,636.71
  6. Step 6: Final answer
    x = 83,134.70

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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.