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Finding the Fourth Proportional to 139,749.68, 209,592.12 and 39,907.28

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Solution

The fourth proportional to 139,749.68, 209,592.12 and 39,907.28 is: 59,851.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,749.68 : 209,592.12 = 39,907.28 : x
  2. Step 2: Convert to fraction form
    139,749.68/209,592.12 = 39,907.28/x
  3. Step 3: Cross multiply
    139,749.68x = 209,592.12 × 39,907.28
  4. Step 4: Simplify right side
    139,749.68x = 8,364,251,418.63
  5. Step 5: Solve for x
    x = 8,364,251,418.63/139,749.68
  6. Step 6: Final answer
    x = 59,851.67

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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.