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Finding the Fourth Proportional to 139,891.32, 209,759.22 and 56,688.12

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Solution

The fourth proportional to 139,891.32, 209,759.22 and 56,688.12 is: 85,000.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,891.32 : 209,759.22 = 56,688.12 : x
  2. Step 2: Convert to fraction form
    139,891.32/209,759.22 = 56,688.12/x
  3. Step 3: Cross multiply
    139,891.32x = 209,759.22 × 56,688.12
  4. Step 4: Simplify right side
    139,891.32x = 11,890,855,834.47
  5. Step 5: Solve for x
    x = 11,890,855,834.47/139,891.32
  6. Step 6: Final answer
    x = 85,000.67

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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.