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Finding the Fourth Proportional to 70,659.12, 105,914.88 and 51,911.28

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Solution

The fourth proportional to 70,659.12, 105,914.88 and 51,911.28 is: 77,812.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,659.12 : 105,914.88 = 51,911.28 : x
  2. Step 2: Convert to fraction form
    70,659.12/105,914.88 = 51,911.28/x
  3. Step 3: Cross multiply
    70,659.12x = 105,914.88 × 51,911.28
  4. Step 4: Simplify right side
    70,659.12x = 5,498,176,991.85
  5. Step 5: Solve for x
    x = 5,498,176,991.85/70,659.12
  6. Step 6: Final answer
    x = 77,812.70

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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.