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Finding the Fourth Proportional to 139,020.80, 208,519.05 and 45,526.55

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Solution

The fourth proportional to 139,020.80, 208,519.05 and 45,526.55 is: 68,285.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,020.80 : 208,519.05 = 45,526.55 : x
  2. Step 2: Convert to fraction form
    139,020.80/208,519.05 = 45,526.55/x
  3. Step 3: Cross multiply
    139,020.80x = 208,519.05 × 45,526.55
  4. Step 4: Simplify right side
    139,020.80x = 9,493,152,955.78
  5. Step 5: Solve for x
    x = 9,493,152,955.78/139,020.80
  6. Step 6: Final answer
    x = 68,285.85

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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.