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Finding the Fourth Proportional to 76,378.70, 114,568.05 and 72,004.70

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Solution

The fourth proportional to 76,378.70, 114,568.05 and 72,004.70 is: 108,007.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,378.70 : 114,568.05 = 72,004.70 : x
  2. Step 2: Convert to fraction form
    76,378.70/114,568.05 = 72,004.70/x
  3. Step 3: Cross multiply
    76,378.70x = 114,568.05 × 72,004.70
  4. Step 4: Simplify right side
    76,378.70x = 8,249,438,069.84
  5. Step 5: Solve for x
    x = 8,249,438,069.84/76,378.70
  6. Step 6: Final answer
    x = 108,007.05

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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.