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Finding the Fourth Proportional to 118,713.60, 163,797.12 and 78,485.76

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Solution

The fourth proportional to 118,713.60, 163,797.12 and 78,485.76 is: 108,292.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,713.60 : 163,797.12 = 78,485.76 : x
  2. Step 2: Convert to fraction form
    118,713.60/163,797.12 = 78,485.76/x
  3. Step 3: Cross multiply
    118,713.60x = 163,797.12 × 78,485.76
  4. Step 4: Simplify right side
    118,713.60x = 12,855,741,449.01
  5. Step 5: Solve for x
    x = 12,855,741,449.01/118,713.60
  6. Step 6: Final answer
    x = 108,292.07

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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.