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Finding the Fourth Proportional to 79,885.28, 119,830.98 and 20,719.40

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Solution

The fourth proportional to 79,885.28, 119,830.98 and 20,719.40 is: 31,079.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,885.28 : 119,830.98 = 20,719.40 : x
  2. Step 2: Convert to fraction form
    79,885.28/119,830.98 = 20,719.40/x
  3. Step 3: Cross multiply
    79,885.28x = 119,830.98 × 20,719.40
  4. Step 4: Simplify right side
    79,885.28x = 2,482,826,007.01
  5. Step 5: Solve for x
    x = 2,482,826,007.01/79,885.28
  6. Step 6: Final answer
    x = 31,079.89

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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.