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Finding the Fourth Proportional to 129,898.60, 194,847.90 and 79,816.30

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Solution

The fourth proportional to 129,898.60, 194,847.90 and 79,816.30 is: 119,724.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,898.60 : 194,847.90 = 79,816.30 : x
  2. Step 2: Convert to fraction form
    129,898.60/194,847.90 = 79,816.30/x
  3. Step 3: Cross multiply
    129,898.60x = 194,847.90 × 79,816.30
  4. Step 4: Simplify right side
    129,898.60x = 15,552,038,440.77
  5. Step 5: Solve for x
    x = 15,552,038,440.77/129,898.60
  6. Step 6: Final answer
    x = 119,724.45

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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.