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Finding the Fourth Proportional to 139,869.28, 209,617.08 and 51,039.28

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Solution

The fourth proportional to 139,869.28, 209,617.08 and 51,039.28 is: 76,490.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,869.28 : 209,617.08 = 51,039.28 : x
  2. Step 2: Convert to fraction form
    139,869.28/209,617.08 = 51,039.28/x
  3. Step 3: Cross multiply
    139,869.28x = 209,617.08 × 51,039.28
  4. Step 4: Simplify right side
    139,869.28x = 10,698,704,838.90
  5. Step 5: Solve for x
    x = 10,698,704,838.90/139,869.28
  6. Step 6: Final answer
    x = 76,490.74

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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.