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Finding the Fourth Proportional to 76,909.80, 115,364.70 and 47,231.40

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Solution

The fourth proportional to 76,909.80, 115,364.70 and 47,231.40 is: 70,847.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,909.80 : 115,364.70 = 47,231.40 : x
  2. Step 2: Convert to fraction form
    76,909.80/115,364.70 = 47,231.40/x
  3. Step 3: Cross multiply
    76,909.80x = 115,364.70 × 47,231.40
  4. Step 4: Simplify right side
    76,909.80x = 5,448,836,291.58
  5. Step 5: Solve for x
    x = 5,448,836,291.58/76,909.80
  6. Step 6: Final answer
    x = 70,847.10

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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.