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Finding the Fourth Proportional to 139,618.80, 209,425.44 and 39,779.64

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Solution

The fourth proportional to 139,618.80, 209,425.44 and 39,779.64 is: 59,668.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,618.80 : 209,425.44 = 39,779.64 : x
  2. Step 2: Convert to fraction form
    139,618.80/209,425.44 = 39,779.64/x
  3. Step 3: Cross multiply
    139,618.80x = 209,425.44 × 39,779.64
  4. Step 4: Simplify right side
    139,618.80x = 8,330,868,610.04
  5. Step 5: Solve for x
    x = 8,330,868,610.04/139,618.80
  6. Step 6: Final answer
    x = 59,668.67

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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.