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Finding the Fourth Proportional to 139,905.34, 209,898.96 and 45,133.72

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Solution

The fourth proportional to 139,905.34, 209,898.96 and 45,133.72 is: 67,713.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,905.34 : 209,898.96 = 45,133.72 : x
  2. Step 2: Convert to fraction form
    139,905.34/209,898.96 = 45,133.72/x
  3. Step 3: Cross multiply
    139,905.34x = 209,898.96 × 45,133.72
  4. Step 4: Simplify right side
    139,905.34x = 9,473,520,888.93
  5. Step 5: Solve for x
    x = 9,473,520,888.93/139,905.34
  6. Step 6: Final answer
    x = 67,713.79

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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.