Home / 78,206.20-107,986.68-72,235.72

Finding the Fourth Proportional to 78,206.20, 107,986.68 and 72,235.72

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Solution

The fourth proportional to 78,206.20, 107,986.68 and 72,235.72 is: 99,742.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,206.20 : 107,986.68 = 72,235.72 : x
  2. Step 2: Convert to fraction form
    78,206.20/107,986.68 = 72,235.72/x
  3. Step 3: Cross multiply
    78,206.20x = 107,986.68 × 72,235.72
  4. Step 4: Simplify right side
    78,206.20x = 7,800,495,580.21
  5. Step 5: Solve for x
    x = 7,800,495,580.21/78,206.20
  6. Step 6: Final answer
    x = 99,742.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.