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Finding the Fourth Proportional to 206,899.70, 310,349.55 and 112,421.30

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Solution

The fourth proportional to 206,899.70, 310,349.55 and 112,421.30 is: 168,631.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,899.70 : 310,349.55 = 112,421.30 : x
  2. Step 2: Convert to fraction form
    206,899.70/310,349.55 = 112,421.30/x
  3. Step 3: Cross multiply
    206,899.70x = 310,349.55 × 112,421.30
  4. Step 4: Simplify right side
    206,899.70x = 34,889,899,865.42
  5. Step 5: Solve for x
    x = 34,889,899,865.42/206,899.70
  6. Step 6: Final answer
    x = 168,631.95

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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.